The work aims to solve the problems of single grinding phase, relatively low hardness of grinding phase materials, low grinding efficiency and poor quality of high-hardness and difficult-to-process materials in the existing sintering process for preparing magnetic abrasive particles and to prepare a new type of magnetic abrasive particles by sintering with cubic boron nitride powder as grinding phase. Iron-based cubic boron nitride magnetic abrasive particles were prepared by sintering method, and the effects of particle size ratio of raw materials and sintering temperature on the grinding performance of magnetic abrasive particles were investigated. TC4 titanium alloy plate and Si3N4 ceramic plate were taken as experimental objects, and the surface quality of workpiece before and after processing was compared by surface roughness measuring instrument and 3D depth-of-field microscope. The surface morphology of magnetic abrasive particles after processing was observed by scanning electron microscope as the evaluation index of grinding performance and service life of magnetic abrasive particles, and the distribution of abrasive phases in magnetic abrasive particles was observed by surface scanning energy spectrum analyzer. Magnetic abrasive particles were prepared by sintering method with iron powder as matrix and cubic boron nitride powder as grinding phase material. The final pressing force was 90 kN, the particle size ratio of matrix and grinding phase was 3∶1, and the sintering temperature was 1 180 ℃. Under these conditions, the magnetic abrasive particles prepared had good grinding performance, which was stronger than that of Al2O3/Fe and SiC/Fe magnetic abrasive particles prepared by sintering method, and the surface finishing of Si3N4 ceramic plate could be realized. After grinding for 39 min, the surface roughness could be reduced from 1.382 μm to 0.117 μm. Iron-based cubic boron nitride magnetic abrasive particles prepared by sintering method can solve the surface quality problems of hard and brittle materials, and can be used as grinding media with excellent performance to participate in grinding, meeting the requirements of magnetic particle grinding and finishing technology.