The invention provides an iron core patch for an electric machine, A stator core and a manufacturing method thereof, Stator, motor and household appliances, wherein the iron core patch is formed by stacking a plurality of iron core punching sheets, each core punch sheet has a yoke portion and a tooth portion, the first end of the yoke portion has a first engaging portion, A first engagement portion includes a socket portion and two tenons and grooves, Between that two tongue and groove, The second end of the yoke portion has a second engagement portion, the second engagement portion comprisinga receiving portion and two tenons, the receiving portion being positioned between the two tenons, the insertion portion and the receiving portion being arranged in a circular shape and the circle being concentric with the yoke portion, the tenon groove being capable of receiving a tenon of another core piece, and the outer end portion of the tenon being capable of being deflected away from the receiving portion by an external force. The iron core patch can reduce the fitting gap between two adjacent iron core patches, and ensure the stable performance of the motor.