Assembly type prefabricated building stair formwork platform

The utility model discloses an assembly type prefabricated building stair formwork platform, and relates to the technical field of assembly type stairs. The device comprises a bearing plate, L-shaped plates and a handrail plate, the multiple L-shaped plates are evenly distributed and installed on the top of the bearing plate, one side of the bearing plate is installed on a building bearing component, the handrail plate is assembled on the side, away from the building bearing component, of the bearing plate, and stretching mechanisms are assembled between the bearing plate and the L-shaped plates. The stretching mechanism is used for assisting the L-shaped plate to adapt to the bearing plates with different gradients, and a connecting mechanism is assembled between the bearing plate and the handrail plate and used for connecting the bearing plate with the handrail plate. Through the structural design of the stretching mechanism, the device can conveniently assist the L-shaped plate to adapt to bearing plates w