Abstract: A cooling system for a high density power motor, in particular an axial-flux electric motor, wherein a pump is directly fitted in an axial position on the output shaft of the electric motor and feeds at outlet a flow of liquid coolant directed towards a first heat exchanger coupled to a power electronic supply circuit of said motor; the first heat exchanger having at least one outlet from which the liquid coolant is fed to a second heat exchanger coupled to the windings of the electric motor for cooling the electric motor itself; the cooling system carrying out in succession removal of the heat from the power electronic supply circuit and then from the electromagnetic part of the motor.