The invention discloses a device for manufacturing lithium ion battery pole piece elements. The device comprises an upper knife mold and a lower knife mold, wherein the upper knife mold comprises a first forming knife mold and a cutting knife mold which is separated from the first forming knife mold; the first forming knife mold comprises a substrate, a raised part, a first cutting face, a second cutting face, a third cutting face and a fourth cutting face; the raised part extends outwards from the first side of the substrate; the first cutting face and the second cutting face are formed on the second side and the third side of the substrate, respectively; the third cutting face and the fourth cutting face are arranged at the first side of the substrate. According to the technical scheme, by adjusting the relative position between the first forming knife mold and the cutting knife mold or by replacing different types of knife molds, various specially shaped lithium ion battery pole piece elements can be manufactured.