The invention discloses a phase change heat dissipation air-cooled motor housing, a manufacturing method thereof and an air-cooled motor using the same. The phase change heat dissipation air-cooled motor housing comprises an annular shell, a plurality of radiating fins arranged at intervals protrude the exterior of the annular shell in the circumferential direction, the motor housing further comprises an upper end plate and a lower end plate, a plurality of vacuum phase change heat dissipation channels are distributed circumferentially in the annular shell, the vacuum phase change heat dissipation channels extend from the upper end face of the annular shell to the lower end face, two ends of the vacuum phase change heat dissipation channels are sealed by the upper end plate and the lower end plate, the vacuum phase change heat dissipation channels are filled with a phase change medium, a porous liquid absorbing layer is arranged on the inner wall of each vacuum phase change heat dissipation channel, and a plurality of liquid absorbing holes are formed in the surface of the porous liquid absorbing layer. The phase change heat dissipation air-cooled motor housing is simple in structure, good in heat dissipation effect, convenient to install and low in cost, can be applied to refit of all commercial permanent-magnet synchronous motors for vehicles, can actuate the electromagnetic performance of motors to be designed toward higher power density, and fulfills the purpose of light weight of motor assemblies.