Abstract: As a key material for manufacturing kitchen knives, the quality of TSCr9LP steel is directly related to the performance and service life of the knives. However, in the cold rolling process of TSCr9LP uncoiled steel plate, under the action of traction force, the fracture of steel plate has always been an important problem affecting the production continuity and restricting the improvement of production efficiency. In this paper, the fracture and the microstructure of the steel plate were analyzed by means of metallographic analysis, XRD test, SEM and EDS test, combined with the heat treatment process of TSCr9LP. It was found that during the annealing process of TSCr9LP steel, due to the long holding time at high temperature, the carbides were coarsely precipitated in the form of M7C3 and aggregated at the grain boundary, which affected the toughness of the steel and was the main factor causing the fracture. In view of these problems, this paper puts forward corresponding improvement measures. After process verification, the problem of broken belt has been significantly improved.