The invention aims at designing a detachable simple two-layer motor home device. The device comprises a tent, a ladder, a car cover, a foldable rack, a folding shaft, a suction disk, an air conditioner, a power source, a venting pipe and a remote control. The foldable rack is fixed to the top of the car through the suction disk and connected with the tent, the ladder is connected to one side of the foldable rack, and the rims of the foldable rack is connected with the car cover. The tent is connected with the air conditioner of the car through the venting pipe. During use, the foldable rack is unfolded and fixed to the top of the car through the suction disk, the tent is put up, the ladder is put down, and the car cover is opened. The air of the air conditioner inside the car is conveyed into the tent through the venting pipe, the power source is electrically connected with the interior of the tent, and the remote control can remotely control the power source and the air conditioner inside the car. The car and the tent form a simple two-layer motor home. When not in use, the tent, the ladder, the car cover and the venting pipe are stored, the power source is cut off, the suction disk is disassembled, the foldable rack is folded along the folding shaft, and all the components above are stored into a box and put into the trunk of the car.