The invention relates to a safety protection device suitable for a hydraulic pitch variation system of a wind generating set and belongs to the technical field of control of wind generating sets. The safety protection device suitable for the hydraulic pitch variation system comprises an embedded industrial controller for signal collection, logic operation and control output in a hydraulic pitch variation control cabinet, a safety relay for monitoring and controlling a safety circuit in real time, a temperature controller and a time relay for monitoring and protecting the temperature, an emergency stop button for manual emergency stop of a hub, a middle relay for transferring a control signal, and a power relay for control of a servo control circuit of an electrohydraulic control device, wherein the safety relay, the temperature controller, the time relay, the emergency stop button, the middle relay and the power relay are all arranged in the safety circuit of the hydraulic pitch variation control cabinet. The safety protection device suitable for the hydraulic pitch variation system disclosed by the invention is independently arranged inside the hydraulic pitch variation control cabinet, and the safety protection performance of the hydraulic pitch variation control system of a large fan can be effectively improved.