The inner swing door pump is a new type of passenger door opening and closing mechanism. Compared with other door pumps, its power transmission mechanism is installed in the air duct at the upper end of the door opening, which does not occupy the space in the vehicle. It has novel and beautiful shape, flexible opening and closing, safe and reliable. At the same time, it has the performance of anti pinch and speed regulation. It is suitable for pure electric vehicles without air source and buses in high and cold areas.