Coupler body casting system

The invention provides a coupler body casting system, and relates to the field of machine manufacturing. The coupler body casting system comprises a cast mold, a first supplementation piece, a second supplementation piece, a gating system, a first open riser and at least one blind riser. The cast mold comprises an upper mold body, a lower mold body, a coupler head, a coupler body and a coupler tail. The upper mold body and the lower mold body are buckled to form a coupler body cavity. One end of the coupler body is connected with the coupler head, and the other end of the coupler body is connected with the coupler tail. The first open riser and the at least one blind riser are located on the face, away from the lower mold body, of the upper mold body of the mold body and communicate with the coupler body cavity. The gating system is located on one side of the cast mold and communicates with the portion, at the position of the coupler body, of the coupler body cavity. The first supplementation piece is located