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It is difficult to determine the value range of the laboratory power harmonic parameters, which leads to the decline of the quality of the laboratory power harmonic depth control. In order to solve this problem as the research objective, the laboratory power harmonic depth control method based on spectral sequence transformation is designed. According to the principle of spectral sequence transformation, the range of harmonic parameters of laboratory electricity is estimated. According to the estimation results, a multilevel inverter is established to extract the harmonics of DFT and DSC, analyze their fluctuation characteristics, and extract the harmonic characteristics of laboratory electricity. The harmonic controller architecture is designed to realize the deep control of power harmonics by calculating the dead zone compensation vector and control parameters. The comparative experimental results show that the designed method can control the current harmonics within the range of 6.8A-12.4A, and the voltage harmonics within the range of 180V-220V, which can greatly improve the stability of the power harmonics and solve the power loss problem.