Dynamic load sensor for polish rod

The utility model provides an oil pumping unit feed rod loading sensor, which consists of a U-shaped beam, a straining measuring circuit, a signal interface and a clamping bolt, wherein, the straining measuring circuit is arranged inside the U-shaped beam, and the transmission of the signal is realized through the signal interface, and the clamping bolt passes through the U-shaped beam, and the outer diameter of a feed rod is slightly smaller than the inner diameter of the U-shaped beam, and the distance between the clamping bolt and the inner bottom of the U-shaped beam adapts to the radius of the feed rod. The sensor has the advantages of simple structure, convenient operation, high precision and small error; moreover, the load of the feed rod can be known through the digital display device.