Oral cavity dilator

The utility model relates to the technical field of oral cavity treatment, in particular to an oral cavity expander which comprises an opening expanding clamp, the opening expanding clamp is composed of a first rotating arm and a second rotating arm, the tail end of the first rotating arm and the tail end of the second rotating arm are each of an annular structure, and reinforcing blocks are fixedly connected to the front end of the first rotating arm and the front end of the second rotating arm. Two occlusion blocks are arranged at the front end of the mouth expanding clamp, the reinforcing block is in sliding connection with the occlusion blocks, occlusion grooves are formed in the side ends of the occlusion blocks, rubber strips are arranged in the occlusion grooves, the front end of the second rotating arm is in threaded connection with a rotating rod, the side end of the first rotating arm is fixedly connected with a supporting block, and the side end of the supporting block is in sliding connection with