This invention provides a power plug device and the manufacturing method thereof, the power plug device comprises a power-connected base; a cover is configured to the power-connected base, wherein the cover can cover the internal components of the power-connected base, such as at least one plug and a printed circuit board, a gap between the cover and a lid is filled with an insulating compound for preventing liquid ingress, and then the power plug device is sealed by using an ultrasonic welding.