The invention provides a multivariate statistics-based positioning method of a sound source of a hearing aid. Wavelet decomposition is carried out on a GCC sequence; and a hotellingT2 statistical method is applied to analyze a wavelet coefficient and a time delay estimation value is estimated. According to the invention, the method, which has good robustness in a reverberant environment and a complex and changeable environment as well as the moderate calculation amount of the algorithm, is suitable for real-time realization and can meet a sound source positioning requirement of a hearing aid.