Building prefabricated slab mounting structure

The utility model relates to a building precast slab mounting structure, which aims to solve the technical problem that two adjacent precast slabs are easy to misplace at present, and comprises a precast slab body and a connecting component, wherein the number of the prefabricated slab bodies is multiple; every two adjacent prefabricated slab bodies are connected through a connecting assembly. The connecting assembly comprises a fixed plate, an inserting groove, a movable groove, a movable plate, a limiting block and an inserting block. The two fixing plates are fixedly arranged on the two adjacent sides of the prefabricated slab body respectively. An inserting groove is formed in the side, away from the fixing plate, of the prefabricated plate body. A movable groove is formed in one side of the fixed plate; the movable plate is arranged in the movable groove in a sliding mode, and the end of the movable plate penetrates through the movable groove and extends to the outside. The two limiting blocks are symmet