The invention discloses a vehicle loading device capable of adjusting the position of a vehicle and preventing the vehicle from inclining and sliding off. The device includes a vehicle loading plate and a base plate, the vehicle loading plate is positioned above the base plate, a sliding rail is arranged on one side above the base plate, a first sliding base and a second sliding base are arranged on the sliding rail, and insertion grooves are symmetrically formed in the two sides of the first sliding base and the two sides of the second sliding base and internally provided with connecting rods in an inserted mode; the end, away from the first sliding base, of each connecting rod is connected with a limiting body provided with a limiting groove, bearing plates are rotatably connected in the limiting grooves, a rack rod is connected to one side of the second sliding base, and an insertion port is formed in one side of the first sliding base and used for being inserted into an insertion rack rod. The rack rod can be in engagement connection with the side surface of a rotating disk constantly to increase or decrease the space between the first sliding base and the second sliding base, achieve stable storage of the vehicle, and therefore the vehicle loading device capable of adjusting the position of the vehicle and preventing the vehicle from inclining and sliding off is provided for users.