The cumulative damage of foundation of ring wind turbine affects the safe operation of wind turbine system. Aiming at the damage problem of foundation concrete during the operation of foundation ring wind turbine, the 49.5 MW wind farm in Inner Mongolia was taken as an example, the damage model of the wind turbine foundation concrete was established by using ABAQUS finite element software and the variation law of foundation concrete damage under static load and cycle load was compared and analyzed. The results show as follows. Under static load condition, the wind turbine foundation concrete mainly produces tensile damage, the compression performance is stable and the rebar skeleton has not reached the limit state. Compared with static load, under cycle load, the tensile damage area increases 3 times, the vertical expansion increases 3 times, the compressive damage area increases 2 times, the displacement increases 1.6 times, and the rebar stress increases 0.5 times, which is helpful to explain the damage behavior of the foundation under cycle load.