Automatic tool changing mechanism of planer type milling machine

The utility model relates to the technical field of machining, in particular to an automatic tool changing mechanism of a planer type milling machine, which can automatically spray anti-rust oil on a milling cutter when the milling cutter is not used for a long time and needs to be stored, and does not need to be manually coated with the anti-rust oil after being disassembled by a worker, so that the time is saved, the labor intensity is reduced, and the working efficiency is improved. Use is convenient, and practicability is high; comprising a portal frame, a disc, two sets of motors A, two sets of rotating shafts, two sets of milling cutters, a lifting device and a rotating device, the lifting device is installed on the upper portion of the portal frame, the rotating device is installed on the lifting device, the lifting device is used for lifting the rotating device, and the disc is installed on the rotating device; the two motors A are fixedly installed on the left portion and the right portion of the dis