The invention discloses a rotor punching sheet, a rotor core with the same and a motor. The rotor punching sheet comprises a body. The body is provided with an inner hole, a plurality of installation grooves and an annular area surrounding the inner hole, wherein the installation grooves are distributed in the circumferential direction of the body, a pole part is defined between every two adjacent installation grooves, an outer magnetic bridge is defined between the outer end of each installation groove and the peripheral edge of the body, an inner magnetic bridge is defined among the every two adjacent installation grooves, the inner ends of the pole parts of the adjacent installation grooves and the annular area, at least one inner magnetic bridge and/or at least one outer magnetic bridge are/is disconnected, and the number of the disconnected inner magnetic bridges and the number of the disconnected outer magnetic bridges are both less than the number of poles of a rotor. According to the rotor punching sheet, magnetic flux leakage caused by the fact that rotating shafts assembled in the pole parts and the rotating shaft in the inner hole are directly communicated or caused by the fact that poles of different polarities are communicated is reduced as much as possible, and performance of the rotor is improved. Additionally, the rotor can be directly molded without injection molding conducted or other connecting parts adopted and is convenient and easy to manufacture.