The invention provides an auxiliary anode tool. The auxiliary anode tool comprises a supporting platform used for supporting and fixing auxiliary anodes and a left supporting platform and a right supporting frame used for supporting the supporting platform; the supporting platform is bridged between the left supporting frame and the right supporting frame, the supporting platform comprises transverse supports connected with the left support frame and the right support frame in a bridging mode, and at least one longitudinal support used for being connected with the auxiliary anodes is connectedto the transverse supports; the transverse supports are provided with transverse long holes allowing the transverse supports to freely move in the left-right direction, and the longitudinal supportsare provided with longitudinal long holes allowing the auxiliary anodes to freely move in the front-and-back direction of the transverse supports, the transverse long holes and the longitudinal long holes are arranged in a crossed manner; the positions of the auxiliary anodes can be flexibly adjusted according to the actual situation of to-be-plated parts through the transverse long holes and thelongitudinal long holes.