Bearing seat clamping instrument

The utility model belongs to the technical field of bearing seat machining, and particularly relates to a bearing seat clamping instrument which comprises an operation table, a rotating groove is formed in the top of the operation table, a rotating shaft is rotatably connected to the inner wall of the operation table, a cross seat is fixedly arranged on the outer wall of the circumference of the rotating shaft, and a cross chuck is fixedly arranged on the outer wall of the circumference of the rotating shaft. Pressing grooves are formed in the two adjacent included angles of the cross-shaped chuck, and a connecting shaft is arranged in the operation table. The stepping motor drives the connecting shaft to rotate intermittently, the connecting shaft drives the cross-shaped cam to rotate, when the cross-shaped cam rotates, the outer protruding part can press the pressing grooves in the cross-shaped chuck, the cross-shaped cam drives the cross-shaped chuck to rotate by 90 degrees, the cross-shaped chuck drives t