Fatigue cycle test system for shape memory alloy spring

The invention discloses a shape memory alloy spring fatigue cycle test system. The device belongs to the field of shape memory alloy spring performance testing and micro-electro-mechanical precision driving, and comprises a sliding rail, a mechanical loading system, a current control system, a temperature and displacement acquisition system and a loading limiting system, the mechanical loading system is provided with a clamp which can simultaneously clamp a plurality of shape memory alloy spring samples for testing, and a loading weight and a limiting device are used for carrying out uniaxial tension loading on the springs; the current control system simulates the actual working condition by applying current to the alloy through the direct-current stabilized power supply, the fan is added to achieve rapid cooling of the alloy during power failure, and on-off controllability of the current and the cooling fan is achieved through the relay. The testing device can simulate actual working conditions to carry out