Grinding head replacing structure of sanding machine

The utility model relates to the technical field of sanding machine grinding head replacement, in particular to a sanding machine grinding head replacement structure which comprises a sanding machine body, a fixed protective shell is installed on the sanding machine body, a grinding head piece is arranged in the fixed protective shell, a movable protective shell is installed on the outer side of the grinding head piece, and the movable protective shell is connected with the fixed protective shell. A movable protection shell is installed on the top face of the sanding machine body, a screw rod is connected to the movable protection shell, a rubber friction plate is arranged on the bottom side of the screw rod, a clamping block is further installed on the top face of the movable protection shell, a fixing block is connected to one side of the clamping block, a grip is connected to the sanding machine body, and an end cover is connected to one end of the grip. According to the utility model, the possibility of r