The invention discloses a design method for a single-phase full-bridge power frequency inverter filter. The design method includes the steps that 1, maximal allowable output voltage drop amount parameters in inverter design indexes are called out; 2, then the parameters are substituted into a filtering parameter formula to be calculated; 3, a single-phase full-bridge power frequency inverter is subjected to simulation run, THD of output voltage in a steady state and a load sudden change running state is captured; 4, the THD obtained in the step 3 is compared with the design index THD; 5, if the THD obtained in the step 3 is smaller than the design index THD, design is completed. Compared with the prior art, inverter load characteristic indexes can be directly achieved, the quantitative relation between filter parameters and inverter load characteristic parameters is clearly described, the experiment shows that load transient characteristic errors achieved by filtering parameters obtained through the method are smaller than 5%, and application and popularization value is achieved.