Precast concrete cover plate mold capable of adjusting length of precast slab

The utility model discloses a precast concrete cover plate die capable of adjusting the length of a precast slab. The device comprises an inverted T-shaped base, side templates are hinged to the periphery of the T-shaped base; two pouring cavities are defined between the side templates and the T-shaped base; one end of each pouring cavity is provided with one or more vertical base plates used foradjusting the length of the prefabricated plate. One or more positioning pieces are evenly distributed between the side formworks on the front side and the rear side and the upper end face of the T-shaped base, square cross beams are movably installed in the positioning pieces, vertically-downward partition plates are fixedly arranged at the left end and the right end of each square cross beam, and tensioning devices are movably arranged between the upper end face of the T-shaped base and the side formworks. The length of the produced prefabricated slab can be adjusted, and meanwhile the prefabricated slab has good st