The work aims to study the erosion and wear characteristics of the flow field of the double nozzle jet pump in the process of hydraulic lifting and drainage and explore the main affecting factors and rules. Based on the basic theory of solid-liquid two-phase flow and erosion model, a simulation model of pump core flow field erosion wear was constructed, and relevant and effective calculations were made on the downhole hydraulic lifting of the double nozzle jet pump for double-layer pipe. Computational fluid dynamics (CFD) method was adopted to simulate the erosion wear behavior of jet pump core flow field, and the areas prone to erosion wear in the use of jet pump core were predicted. The effect of particle diameter, mass flow rate and dynamic fluid flow rate on the erosion characteristics of pump core was investigated. On the inner wall of the throat entrance, the inner wall of the throat outlet and the inner wall near the entrance of the diffusion tube, the erosion of the nozzle, the middle part of the throat and the wall at the end of the diffusion tube was small, and the erosion shape of the cone of the throat entrance was "triangle". The erosion-prone area should be considered and strengthened in the design. Under the condition of controlling single factor variables, when the particle size increased from 0.05 mm to 1.1 mm, the erosion position of the cone surface of the inlet of the pipe changed from a closed circle to a triangular shape, and the erosion area at the entrance of the diffusion tube gradually decreased. The maximum erosion rate of one surface of the inlet of the pipe with a particle size of 0.1 mm was 5.5 times that of that with a particle size of 0.7 mm. The maximum erosion rate of the tube-diffusion tube with a particle size of 0.1 mm was 6.2 times of that with particle size of 1.1 mm. When the mass flow rate increased from 0.005 kg/s to 0.01 kg/s, the maximum erosion rate and the erosion area in the erosion-prone area increased with the increase of the mass flow rate, the maximum erosion rate of the inlet cone of the throat increased by 2 times, and the maximum erosion rate of the throat-diffusion tube increased by 1.93 times. When the power fluid flow rate increased from 11 L/s to 15 L/s, the maximum erosion rate in the erosion-prone area increased with the increase of the power fluid flow rate, the maximum erosion rate of the inlet cone of the throat increased by 14.2 times, and the maximum erosion rate of the gut-diffusion tube increased by 1.3 times. Based on the analysis of the maximum erosion rate and the growth multiple, the dynamic fluid flow rate is the main factor of erosion rate growth, and strict control of the dynamic fluid flow rate can significantly reduce the erosion situation. This study provides theoretical basis and data support for the design of a new type of jet pump with diverter nozzle structure, offers guidance for the design and application of double nozzle jet pump, and has important reference significance for reducing the cost and risk of oil and gas production.