The invention relates to the technical field of environment-friendly energy-saving vehicle washing equipment, in particular to a domestic solar automatic vehicle washing device. The domestic solar automatic vehicle washing device comprises a movable box body and a vehicle washing mechanism, and the movable box body comprises a vehicle detergent preparing cavity located above the movable box body,an accommodation cavity which is located below the movable box body and a box lid which is arranged at the top of the movable box body; the vehicle detergent preparing cavity is provided with a liquidinlet, a liquid outlet and a direct communicating pipe connected with the liquid inlet and the liquid outlet; a vehicle detergent placing box communicated with the vehicle detergent preparing cavityis arranged at the top of the box lid, and the vehicle washing preparing cavity is further internally provided with a vehicle detergent stirring rod. The domestic solar automatic vehicle washing device can automatically wash a vehicle, is easy and convenient to operate, saves a large amount of time and labor for a vehicle owner, is driven by solar energy, is environment friendly and also saves energy.