This　paper　proposes　a　novel　damping　method　for　the　resonance　problem　of　the　LCL　output　filter　in　the　active　power　filter　(SAPF).　The　wide　control　bandwidth　of　the　SAPF　has　made　this　problem　critical.　The　proposed　method　is　based　on　an　active　damping　circuit,　which　does　not　affect　SAPF　control.　It　involves　an　auxiliary　converter　connected　in　series　with　a　filter　capacitor　to　detect　and　inject　back　the　resonant　current　as　the　reference　signal　of　the　converter.　The　stability　of　the　proposed　method　is　analyzed　using　frequency　response　and　compared　to　the　traditional　method　to　prove　theoretical　feasibility.　The　experimental　results　demonstrate　the　effectiveness　of　the　proposed　method,　which　has　a　better　switching　harmonic　suppression　effect　compared　to　the　traditional　method.