Gap adjusting gear convenient to adjust

The gap adjusting gear convenient to adjust comprises a gear machine, a fixed gear and a movable gear, and the left side of the gear machine is fixedly connected with the right side of the fixed gear. Through cooperative use of a connecting rod, a limiting rod, a positioning mechanism and a transmission mechanism, after the transmission mechanism drives the positioning mechanism to move to a proper position, a movable gear is pulled to move, after the transmission mechanism is adjusted to the proper position, the transmission mechanism is loosened, and the movable gear is fixed through the limiting rod while the positioning mechanism resets; the gear clearance adjusting device solves the problems that in the prior art, when gears of different models are replaced for transmission, the clearance between the gears needs to be adjusted, bolts for fixing the gears need to be loosened firstly in the adjusting process, then twisting adjustment is conducted through an installed threaded rod, the adjusting process is