Abstract: The present disclosure provides a power unit, aiming to provide a four-in-one drive powertrain for an electric vehicle. Key points of the technical scheme include a shell body. One side of the shell body is formed with a chamber having a partition structure arranged in a middle part thereof, the partition structure separates the chamber into a control part and a drive part, and the other side of the shell body is provided with a deceleration part and a DC/DC part. The control part includes a containing cavity positioned on a left side of the chamber and integrally formed with the shell body to place a controller. The drive part includes an accommodating cavity positioned on a right side of the chamber and integrally formed with the shell body to install an electric motor.