The present invention relates to a calculation method for the energy utilization rate self-adaptive system of a wind power plant. According to the invention, according to the related parameters of a fan within a certain period of time t, the actual operation state S of the fan at any moment can be adaptively determined. The fan has seven actual operation states in total, and the seven actual operation states are respectively composed of a normal operation state S1, a disease-carrying load-limited operation state S2, a field affected shutdown state S3, a fault shutdown state S4, a maintenance shutdown state S5, a load-limited operation state S6, and a power-limited shutdown state S7. The time periods of the fan within the period of time t0-t1 in the above seven actual operation states are respectively recorded. The above related parameters are composed of the state St of a PLC, the current It of a power collecting circuit, the wind speed Vt and the power Pt.