The work aims to analyze anticorrosion behavior of Al2O3-TiO2 composite ceramic coating in flowing super LBE. Al2O3-TiO2 composite ceramic coating was prepared on the CLAM steel in oxyacetylene flame spraying-laser in-situ synthesis reaction compound technology with pure Ti, FeAl and CrFe powders. Anticorrosion behavior of the coating in flowing lead-bismuth eutectic (LBE) alloy was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) by carrying out 1000 h dynamic corrosion test to the sample in liquid LBE alloy at 500 ℃ with flow velocity of 0.3 m/s. The overall morphology of Al2O3-TiO2 composite ceramic coating surface remained intact compared to that before corrosion, coating phase composition remained stable, sectional analysis of lead-bismuth alloy was free from penetration in the coating during corrosion. The CLAM steel substrate without a protective coating was subject to obvious oxidation corrosion on the surface, loose structure of Fe3O4 oxide layer was generated, the lead-bismuth alloy was dispersed in the oxide layer. The Al2O3-TiO2 composite ceramic coating prepared in oxyacetylene flame spraying-laser in-situ reaction method exhibits stable structure and excellent applicability, and can protect the substrate CLAM steel effectively in flowing lead-bismuth eutectic (LBE) alloy.