Fatigue testing device

The invention discloses a fatigue testing device, and relates to a testing device, in particular to a fatigue testing device. The invention aims to solve the problems that the existing fatigue test equipment is poor in adaptability, low in flexibility, high in cost, tedious in operation, low in test efficiency, poor in mobility and inconvenient for fatigue test, and extra auxiliary design and processing are often needed. The fatigue testing device comprises a motor and a mechanical arm body, and the motor is connected with the mechanical arm body and controls opening and closing of the mechanical arm body; the fatigue testing device further comprises a support, a rodless air cylinder, a fatigue sensor assembly and a mechanical arm support, the rodless air cylinder is fixedly installed on the support, the fatigue sensor assembly is installed on a sliding block of the rodless air cylinder, the mechanical arm support is installed on the fatigue sensor assembly, and the motor and the mechanical arm are both insta