The invention discloses a method for controlling the harmonic current of a full-power converter for suppressing wind power grid integration and a controller. The method comprises the following steps of: acquiring three-phase current and three-phase voltage of a grid-integrated converter, performing constant power conversion on an acquired network side three-phase current signal from a static three-phase coordinate system to synchronous, five-time, seven-time, eleven-time and thirteen-time rotary coordinate systems, and performing low pass filtering to obtain a dq axis component; and obtaining a dq axis control voltage by adopting a network voltage directional vector control way, performing constant power conversion on the control voltage from synchronous, five-time, seven-time, eleven-time and thirteen-time rotary coordinate systems to the static three-phase coordinate system to obtain a fundamental wave control voltage and five-time, seven-time, eleven-time and thirteen-time harmonic wave three-phase control voltages, adding the fundamental wave control voltage and the five-time, seven-time, eleven-time and thirteen-time harmonic wave three-phase control voltages to obtain a final control voltage, and modulating the final control voltage to obtain a control switch signal, so that accurate control of five-time, seven-time, eleven-time and thirteen-time harmonic current is realized.