Expansion joint fatigue test device

The invention discloses an expansion joint fatigue test device. The device comprises a support, fixing frames symmetrically arranged on the two sides of the support, a test cabin, an upper connectingpipe, a lower connecting pipe and a vibration meter; the two sides of the test cabin are fixedly connected with the fixing frames respectively, a plurality of heating resistance wire sets are arrangedon the inner wall of the test cabin, and an expansion joint is arranged in the middle of the test cabin; a lower end flange of the upper connecting pipe is hermetically and fixedly connected with anupper flange of the expansion joint, and an upper end flange of the upper connecting pipe is fixedly connected with a piston rod of a hydraulic system; an upper end flange of the lower connecting pipeis hermetically and fixedly connected with a lower flange of the expansion joint, and a lower end flange of the lower connecting pipe is fixedly connected with a bottom plate of the support; the vibration meter is fixed on one