The invention relates to an in-place testing system of an AGC (automatic gain control) and AVC (automatic volume control) function of a wind power station and a realizing method thereof. The in-place testing system comprises a configuration background, an intelligent signal generator and a data acquisition unit which are connected; the configuration background is connected with the intelligent signal generator through a USB interface; the intelligent signal generator is connected with the data acquisition unit; the intelligent signal generator is connected with a wind power station booster station monitoring system or an AVC device of a wind power station device; and the wind power station booster station monitoring system is connected with a wind power generation unit energy management platform through a network interface. The in-place testing system disclosed by the invention has the advantages of complete functions and high automation degree, and integrates data acquiring, analyzing, processing and result-outputting in one body; and according to the relating method of the in-place testing system, disclosed by the invention, when a wind condition meets test requirements, a complete test period can be automatically finished by the in-place testing system without manual intervention.