The invention discloses a box-shaped mold plate capable of being opened and closed automatically. The box-shaped mold plate comprises an opening and closing box wall and a base. The opening and closing box wall comprises two sets of hinged mold plates and hydraulic cylinders used for controlling the corresponding mold plates to be opened and closed. Each hinged mold plate comprises a first mold plate body, a second mold plate body and a pin shaft. Pin holes are formed in the edges of one sides of the first mold plate bodies and the edges of one sides of the second mold plate bodies. The pin shafts penetrate through the corresponding pin holes to be connected with the first mold plate bodies and the second mold plate bodies. The lower ends of the pin shafts penetrate through holes formed in the base. The lower ends of the first mold plate bodies and the lower ends of the second mold plate bodies are provided with wedge-shaped blocks, and the edge of the base is provided with reverse wedge-shaped grooves. Through combination of the opening and closing box wall and the base, the hydraulic cylinders are used as power devices to control the mold plate bodies to be opened and closed, and the wedge-shaped blocks on the opening and closing box wall and the reverse wedge-shaped grooves in a base plate are matched with each other to be automatically separated and fixedly clamped. The defects that original mold plates need to be manually combined and fixed and thus dismounting is inconvenient and production efficiency is influenced are overcome. The box-shaped mold plate capable of being opened and closed automatically has the characteristics of being simple in structure, easy to operate and capable of improving production efficiency.