The invention relates to a spraying device, in particular to an auxiliary spraying device for a stage. According to the technical problem to be solved, the auxiliary spraying device disclosed by the invention has the advantages of wide injection range, diversified injection angles and simplicity in operation, and comprises a bottom plate, a first rack, a first sliding rail, a first gear, a first slide block, a sprayer, an L-shaped rack, a moving plate, a second rack, a bracing wire, a bearing block and the like, wherein the first sliding rail and a first motor are arranged at the top of the bottom plate; the first sliding rail is positioned at the left of the first motor; the first slide block is arranged on the first sliding rail; the first rack is arranged at the right of the first slide block; the L-shaped rack is arranged at the top of the first rack; the sprayer is arranged at the inner bottom of the L-shaped rack; the right end of the sprayer is connected with a hose. According to the device disclosed by the invention, the effects of wide injection range, diversified injection angles and simplicity in operation are achieved when the device is used for spraying.