A washing device includes a main body, a water system, and a drying system. The main body includes a first washing zone, a second washing zone, and a drying zone. A transporting device transports an object to make it pass through the first washing zone, the second washing zone, and the drying zone. The first washing zone has a first water outlet, and the second washing zone has a second water outlet. The water system includes a heater for heating water and a tank. A first pipe connects the heater and the first water outlet, and a second pipe connects the heater and the tank. An outlet pipe connects the tank and the second water outlet. A collecting structure collects waste water and injects into the tank. The drying system is adapted to supply air flow to the drying zone for drying the object.
