this paper presents a three-phase power quality data compression methods based on compressed sensing .First of all, the three-phase power quality disturbance signal within the time t is converted into a 3 t time of one dimensional signal ;Then the traditional problem of multiband fusion theory is applied to the compression perception dictionary design, constructing a complete dictionary; Lastly, Gaussian random matrix as the observation matrix, the OMP algorithm as a reconstruction algorithm, reconstruction of three-phase power quality disturbance signals and detection of power quality parameters. The experimental results show that the method can effectively compress the three-phase power quality data ,at the same time implement three-phase power quality disturbance signal processing and detect multiple performance parameters.