Novel tool changing mechanism

The utility model relates to a novel tool changing mechanism which comprises a rolling disc, a through groove is formed in the surface of one side of the rolling disc, a main shaft is connected to the through groove in one side of the rolling disc in a penetrating mode, a flange plate is fixedly installed on one side of the main shaft, and one side of the main shaft is fixedly installed on one side of the rolling disc through the flange plate. A guide assembly is fixedly mounted at the top of the outer cambered surface of the upper surface of the main shaft and comprises a fixed seat fixedly mounted at the top of the outer cambered surface of the main shaft, a push part is driven by a guide part at the rear end to enable the front end to abut against the cutter, the U-shaped clamping frame is restored to the initial state, and meanwhile, extension springs on the two sides are elastically restored to loosen clamping arms on the two sides; the tool can be replaced, and the problems that a main shaft in a machin