Oil field shaft mouth clamping seat

The invention relates to oilfield workover operation equipment, in particular to an automatic oilfield well-head clamping base for use in workover operation. A clamping base body is arranged on a frame. The inside of the clamping base is provided with a slip. A part, around the slip, of the frame is provided with a crankshaft with a slip connecting rod. One end of the slip connecting rod is fixedly connected with the crankshaft, while the other end is hinged with the slip. The bottom of the frame is provided with a hydraulic cylinder which is connected with the crankshaft through a four-linkage mechanism. The inside of the frame is provided with a hydraulic control electromagnetic valve set which is connected with the hydraulic cylinder through an oil line. A working panel is arranged on the clamping base body. Parts, at two sides of the working panel, of the frame are provided with an upper detection optical screen, a well-head clamp locking device, a lower detection optical screen and a well-head clamp unlo