The invention relates to preflanging equipment. The preflanging equipment consists of a base, a bottom concave mold part, a pressing part, a turnover mechanism part, a balance locking module and an insert flanging device. The preflanging equipment is characterized in that the bottom concave mold part consists of a concave mold, an outer plate positioning plate, an outer plate determining device and an inner plate determining device; the outer plate positioning plate is fixedly connected to the outer edge position of the concave mold; the bottom surface of the concave mold is fixedly connected with the top surface of the base; and the outer plate determining device and the inner plate determining device are fixedly connected to the top surface of the base. The preflanging equipment solves the problem of incapability of finishing the product pressing through one set of pressing molds due to more than 115 degrees of angles of basin-shaped pressing products with robot coating demands in three directions before pressing.