The invention discloses an automatic pasting device for oil duct stays of a distribution transformer. The automatic pasting device comprises a sorting mechanism, a feeding mechanism, a gumming mechanism, a pasting mechanism, a laminating stepping mechanism and a winding mechanism, wherein the feeding mechanism comprises a conveying adhesive tape and a feeding wheel; the feeding wheel drives the conveying adhesive tape to advance; the sorting mechanism, the gumming mechanism, the pasting mechanism, the laminating stepping mechanism and the winding mechanism are sequentially arranged along the conveying direction of the conveying adhesive tape; the sorting mechanism is located at an input end of the conveying adhesive tape; and the winding mechanism is located at an output end of the conveying adhesive tape. The invention further discloses an automatic pasting method for the oil duct stays of the distribution transformer by using the automatic pasting device. According to the automatic pasting device and pasting method for the oil duct stays of the distribution transformer, full-automatic control on the whole process of processing an oil duct stay curtain can be achieved, unmanned oil duct processing is achieved, and the fundamental problems that the processing efficiency of the oil duct stay curtain is low, quality fluctuation is relatively large and the quality of a product isgreatly affected by human factors are fundamentally solved.