A motor rotor, comprising a wound rotor, wherein the wound rotor comprises a rotating shaft, a rotor core, and a plurality of rotor coils, the rotor core is fixedly sleeved on the rotating shaft, a plurality of winding slots surrounding the rotating shaft are provided at intervals on the rotor core, each winding slot extending between two axial ends of the rotor core and being circumferentially delimited by two adjacent salient poles of said rotor core, wherein each rotor coil is wound around a salient pole arranged between two adjacent winding slots, and two adjacent rotor coils share one winding slot; and wherein a gap is formed, within each slot, between two adjacent rotor coils, wherein a first shaft hole is formed on the rotating shaft, and the gap is configured as a first heat dissipation channel connected to the first shaft hole, wherein the first shaft hole on the rotating shaft penetrates through a sidewall of the rotating shaft so as to ensure that two ends of the first shaft hole are respectively connected to an inner cavity of the rotating shaft and the first heat dissipation channel; wherein a plurality of first shaft holes are provided at intervals on the rotating shaft in a circumferential direction, and a quantity of first shaft holes is equal to or less than a quantity of first heat dissipation channels; wherein the wound rotor further comprises a first end plate and a second end plate that are respectively disposed at the two ends that are of the rotor core and that are in the axial direction; and a first radial channel configured to connect the first shaft hole and the first heat dissipation channel is formed between the rotor core and the first end plate, a first outlet channel connected to an outside of the rotor core is formed between the second end plate and the rotor core, and the first heat dissipation channel is connected to the first outlet channel; wherein the wound rotor further comprises a first reinforcement assembly; and the first reinforcement assembly is disposed between the first end plate and the rotor core, and the first radial channel is disposed between the first reinforcement assembly and the first end plate; and wherein the first reinforcement assembly comprises a first potting adhesive; and a plurality of first radial holes surrounding the rotating shaft are provided at intervals on the first potting adhesive, the first radial hole separately extends to the first heat dissipation channel and the first end plate in the axial direction, and the first radial channel comprises at least a part that is of the first radial hole and that extends in a radial direction. the wound rotor comprises a rotating shaft, a rotor core, and a plurality of rotor coils, the rotor core is fixedly sleeved on the rotating shaft, a plurality of winding slots surrounding the rotating shaft are provided at intervals on the rotor core, each winding slot extending between two axial ends of the rotor core and being circumferentially delimited by two adjacent salient poles of said rotor core, wherein each rotor coil is wound around a salient pole arranged between two adjacent winding slots, and two adjacent rotor coils share one winding slot; and wherein a gap is formed, within each slot, between two adjacent rotor coils, wherein a first shaft hole is formed on the rotating shaft, and the gap is configured as a first heat dissipation channel connected to the first shaft hole, wherein the first shaft hole on the rotating shaft penetrates through a sidewall of the rotating shaft so as to ensure that two ends of the first shaft hole are respectively connected to an inner cavity of the rotating shaft and the first heat dissipation channel; wherein a plurality of first shaft holes are provided at intervals on the rotating shaft in a circumferential direction, and a quantity of first shaft holes is equal to or less than a quantity of first heat dissipation channels; wherein the wound rotor further comprises a first end plate and a second end plate that are respectively disposed at the two ends that are of the rotor core and that are in the axial direction; and a first radial channel configured to connect the first shaft hole and the first heat dissipation channel is formed between the rotor core and the first end plate, a first outlet channel connected to an outside of the rotor core is formed between the second end plate and the rotor core, and the first heat dissipation channel is connected to the first outlet channel; wherein the wound rotor further comprises a first reinforcement assembly; and the first reinforcement assembly is disposed between the first end plate and the rotor core, and the first radial channel is disposed between the first reinforcement assembly and the first end plate; and wherein the first reinforcement assembly comprises a first potting adhesive; and a plurality of first radial holes surrounding the rotating shaft are provided at intervals on the first potting adhesive, the first radial hole separately extends to the first heat dissipation channel and the first end plate in the axial direction, and the first radial channel comprises at least a part that is of the first radial hole and that extends in a radial direction.