Cutting tool stable in installation

The utility model belongs to the technical field of cutting tools, and particularly relates to a stably-installed cutting tool which comprises a shaft seat, an inserting groove is formed in the front wall of the shaft seat, a tool bar is inserted into the inserting groove, and the top face of the shaft seat is in threaded connection with a plurality of inside hexagonal bolts through threaded holes in a linear equal-interval structure. The bottom face of the inner hexagon bolt makes friction contact with the top face of the cutter bar, a plurality of clamping grooves are formed in the left end of the cutter bar in a vertically symmetrical structure, a fixing block is fixedly arranged on the front wall of the left end of the shaft seat, a sliding groove is formed in the upper end of the fixing block, an L-shaped block is slidably connected into the sliding groove, and a clamping assembly is arranged at the left end of the L-shaped block. The top face of the right end of the L-shaped block is in friction contact