The invention discloses an electric energy quality monitoring device, and mainly relates to the technical field of electricity. The electric energy quality monitoring device comprises a shell, a circuit board is arranged in the shell, and a voltage/current processing module and a DSP module are arranged on the circuit board. The voltage/current processing module is connected with the DSP module and used for acquiring detection signals of a monitoring point and filtering the detection signals to obtain a first signal of the monitoring point, and the first signal is sent to the DSP module. The DSP module carries out calculation based on frequency information and sampled signals to obtain electric energy quality parameters of a user side. The electric energy quality monitoring device has the advantages that a DSP is adopted as a core processing unit of the electric energy quality monitoring device, the cost of the device can be reduced, the DSP can carry out storage and transmission, the completeness of the electric energy quality parameters of the user side can be guaranteed, and the problems that monitoring parameters are incomplete, and the monitoring range is limited can be solved.