Pitch of blade adjusting device for controlling wind wheel

A pitch of blade adjusting device for controlling wind wheel relates to the technical field of wind power generation, and solves the technical problems of lowering the cost and failure rate. The system comprises a wind wheel with a blade, a power generation set, a blade adjusting controller, a blade adjusting executing unit and a checking unit, wherein the blade adjusting controller controls the blade adjusting executing unit to operate, the blade adjusting executing unit is used to control the blade pitch angle changes of the wind wheel, the wind wheel is connected with the power generation set and is used to drive the power generation set to generate electricity, and the checking unit is used to check the blade pitch angle of the wind wheel and the power of the power generation set and to transmit feedback signals to the blade adjusting controller. The pitch of blade adjusting device is characterized in that the blade adjusting executing unit is a gyrate type hydraulic cylinder and a control loop thereof, the gyrate type hydraulic cylinder comprises a cylinder body, end caps on two ends of the cylinder body, two stators and a rotor in the cylinder body, the blade of the wind wheel is connected with a rotation shaft of the rotor, and the system provided by the utility model has low cost and low failure rate, and can be started at any time to generate electricity.