An end effector and staple cartridge assembly thereof, and surgical instrument the staple cartridge assembly includes a cartridge, a wedge and a cutting knife the wedge is slidably mounted to the cartridge the cutting knife is positioned in a cutting slot of the cartridge one end of the cutting knife that is distal from a staple exiting surface of the cartridge is pivotally connected to the wedge via a pin an axial of the pin is perpendicular to the cutting slot the proximal surface of the cutting knife contacts against a pushing surface an elastic resetting member is arranged between the cutting knife and the wedge.
