Fixture for building forms

The utility model relates to a fixture for building forms, comprising supports A, a pressure plate A, pressure rods A, supports B, a pressure plate B, pressure rods B, fixing bolts, screws and turning rods. The lower ends of the supports A are connected to the pressure plate A. The upper ends of the supports A are connected to the pressure rods A. The lower ends of the supports B are connected to the pressure plate B; the upper ends of the supports B are connected to the pressure rods B; the supports A are hinged to the supports B; the pressure rods B are provided with holes; the fixing bolts are disposed on the pressure rods B; holes of the fixing bolts correspond to other holes; one end of each screw sequentially penetrates one fixing bolt and one hole and is rotatably connected to one pressure rod A; the other end of each screw is provided with one turning rod. The fixture is simple in structure and convenient to use, and allows the upper free end of a formwork to be enhanced, thus ensuring that the upper edges of a concrete member are flat and vertical.