The invention provides a self-help vehicle washing service station roof solar device with a wastewater recycling device. The self-help vehicle washing service station roof solar device comprises a solar conversion system, a vehicle washing system and a wastewater recycling system, wherein the solar conversion system is connected with the vehicle washing system; the vehicle washing system is connected with the wastewater recycling system; the solar conversion system comprises a solar battery panel, battery panel support rods, a solar storage battery, a battery controller, a solar battery plate rotating shaft, a rotating shaft driving motor and a rotating shaft driving belt; the vehicle washing system comprises a vehicle washing water tank, a water tank heating rod, a temperature sensor, a washing machine controller and a vehicle washing nozzle; the wastewater recycling system comprises a wastewater storage tank, an impurity depositing tank, a compression pump, a sewage processing tank, a filtering layer and a filtering layer cleaning hole. The self-help vehicle washing service station roof solar device has the benefits that the utilization rate of vehicle washing wastewater is effectively increased, the pollution of the wastewater to the environment is alleviated, moreover, due to the adoption of the rotating solar battery panel, the solar absorption rate can be effectively increased.