The invention discloses a method for analyzing grid-connected power quality of an inverter with consideration of a dead zone effect of equipment. The method comprises:S1, a grid-connected equivalent output impedance model of an inverter under influence of a dead zone effect of an inverter is considered; S2, a long-line distribution parameter model is established and an input impedance amplitude-frequency characteristic is analyzed; and S3, a stability margin of an inverter grid-connected system is analyzed by using an impedance analysis method. The method has the following advantages: important guidance for a plan design of a large new-energy station and a grid-connected stability analysis of an inverter under weak grid access can be provided; and a theoretical basis is provided for grid-connected stable operation of the new-energy station can be provided.