Rolling contact fatigue crack propagation test device

The invention belongs to the field of testing the strength characteristic of a solid material by using mechanical stress, and particularly relates to a rolling contact fatigue crack propagation test device. In order to solve the technical problem that when the crack propagation rate of a component in rolling contact with other components is measured according to a standard file in the prior art, the error of the crack propagation rate measured in a material tensile test or a material bending test is relatively large, the invention provides a rolling contact fatigue crack propagation test device. The rolling contact fatigue crack propagation test device comprises a loading connecting piece and an eccentric cam hinged to the lower portion of the loading connecting piece, and one part of the peripheral face of the eccentric cam is a loading face used for making rolling contact with the upper surface of a to-be-tested piece all the time in the test process. The loading connecting piece is provided with a connecti