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The detection of transient power quality disturbance is a difficulty of power quality detection. Also it is the focus of power quality detection research. A new strategy that wavelet transformation is used on DSP to realize the detection of transient power quality disturbance is mentioned. Disperse wavelet transformation and Mallat arithmetic based on multi-resolution analysis are used in wavelet arithmetic. Db series wavelets are used as wavelet base. Db4 wavelet is used to denoise. High speed DSP is used as the hardware foundation of the transient power quality disturbance detection. The basic principium of the wavelet transformation in transient power quality disturbance detection is mentioned in this article. And its actualization circuits on DSP and the strategy of program are expatiated. The results of the simulation are presented at last.