The invention provides a forming device of a metal plate local feature. The device comprises a driving mechanism, a forming mechanism and a supporting assembly, wherein the driving mechanism and the forming mechanism are installed on the supporting assembly; the forming mechanism comprises a incremental pressing mold and a guiding assembly, the incremental pressing mold is connected to the guidingassembly in a sliding mode, the driving mechanism is connected with the incremental pressing mold, and the driving mechanism can drive the incremental pressing mold to move relative to the guiding assembly; an upper mold and a lower mold are formed in the incremental pressing mold in an up-and-down direction; a material clamping space is formed between the upper mold and the lower mold; an inclined guiding surface is arranged on the guiding assembly; and the upper mold and/or the lower mold moves along the inclined guiding surface so that the upper mold and the lower mold can move relative toeach other in the vertical direction. The invention further provides a forming method using the metal plate material local feature forming device. Compared with stamping forming, the method and device have the advantages that incremental forming is adopted, small transverse traction force is changed into large forming pressure through a force increasing effect, the elastic recovery of a formed part is small, and the residual stress is small.