The invention provides a tinning method and a device. The tinning device comprises a tin furnace, a tinning groove, a liquid scrapping piece and a drop cutting piece. A tin groove where heating can be performed and tin liquid is accommodated is arranged in the tin furnace. The tinning groove is immersed in the tin groove and is capable of up-down moving on the tin liquid surface of the tin groove borne by a carrier frame driven by a driving piece. The liquid scrapping piece is arranged on a carrier seat. The carrier seat is driven by a liquid scrapping driving piece and is capable of driving the liquid scrapping piece to front-back move on the tin liquid surface of the tin groove to perform scrapping work of a tin liquid surface oxide layer. The drop cutting piece is arranged in front of the liquid scrapping piece, and driven by a liquid cutting driving piece to drive the drop cutting piece to front-back move on the tin liquid surface of the tin groove. The drop cutting piece can be driven to move to cut stretched tin liquid drops to cut off the stretched parts.