The utility model discloses an inclined rail side face lifting translation double-layer parking device, and belongs to traffic auxiliary facilities. The parking device comprises a first layer vehicle bearing plate unit (1), a second layer vehicle bearing unit (2), a main body frame unit (3), a U-type reinforcing rib base plate unit (4), a control unit (5) and an advertisement unit (6). The inclined rail side face lifting translation double-layer parking device is composed of the two layers of vehicle bearing plate units, and the layers can be assembled singly and controlled respectively, move independently and do not interfere with each other. Outer stand column and guide rails are arranged to be inclined, stability of the parking device in vehicle parking and taking process of the second layer is increased, and therefore the inclined rail side face lifting translation double-layer parking device is an optimum device for solving parking difficulty in a city and relieving a traffic jam.