In order to optimize the design of the sliding valve core in the drilling and cutting integrated hydraulic slotting system, ensure the reliability of the hydraulic slotting system, and ensure the antireflection effect of the coal seam, based on the PJL-506 model of the hydraulic slotting device of Shandong Yikuang Drilling and Mining Technology Co., Ltd., the three-dimensional basin models of the end face force and the high-pressure jet working condition were established respectively. The theoretical analysis combined with the Fluent simulation method was used to comprehensively analyze the influence of the structural change of the sliding valve core on the end face force effect and the dynamic characteristics of the water jet impact. The sliding valve core was optimized and the stability of the sliding valve in practical application was verified by laboratory tests. The research results show that the shape of the sliding valve core facing the water surface is the optimal structure with the comprehensive shape of the arc surface and the gathering energy hole, which is 11.81 % and 118.52 % higher than the axial force and the maximum reverse flow velocity of the plane end face sliding valve, respectively, and the effective expansion area is increased by 10.89 % compared with the plane end face target distance of 100 mm, which is more conducive to the movement of the sliding valve and the higher coal breaking efficiency.