Disclosed is a harmonic analysis and treatment method for a doubly-fed wind power generator set grid-connection. The method comprises: based on a mathematical model of the doubly-fed wind power generator set, constructing an electromagnetic transient model of a doubly-fed wind power generator set; performing electromagnetic transient simulation calculation on a wind power plant by using an ADPSS simulation system to obtain a harmonic current and a harmonic voltage injected into a power grid by the wind power plant; comparing the harmonic current injected into the power grid by the wind power plant with a harmonic current limit value, and comparing the harmonic voltage injected into the power grid by the wind power plant with a harmonic voltage limit value, and determining whether the harmonic current or harmonic voltage injected into the power grid by the wind power plant exceeds a standard; and if the harmonic current injected into the power grid by the wind power plant exceeds the standard, designing an active filter, establishing a wind power plant electromagnetic transient model containing the active filter, and compensating for the harmonic current in the power grid.