Abstract: Automatic parking lot is an important part of automatic operation system in urban rail transit, and automatic train cleaning machine is an important component in the automatic parking lot. Combing with the Yancun North Automatic Parking Lot in Yanshan—Fangshang Line, this article designed the process of automatic train cleaning and the interface between interlocking system and automatic train cleaning machine, implemented the automatic train cleaning function. The Automatic Parking Lot has passed the self test in a test running, the automatic train cleaning function could meet the needs of design.