The invention relates to a paddle rotary testing device of yield stress of sticky materials. The device is composed of a direct current brushless motor, a decelerator, a drive circuit of the direct current brushless motor, a coupling, a torque sensor, a single-chip microcomputer measuring circuit, a liquid crystal display screen, a keyboard, a connection cutting sleeve, a rotor and a housing. In the invention, the rotating speed of the rotor can be adjusted, and the yield stress of the material and the change of the rotating speed of the rotor can be monitored in real time. The testing devicehas a peak value maintaining function, and can record and display the maximum yield stress value. The testing device in the invention, which is mainly applied to the yield stress testing of sticky materials, has the characteristics of compact structure, small volume, and being convenience in operation, stable in performance and high in accuracy.