A washing device includes a main body (10), a water system (20), and a drying system (30). The main body (10) includes a first washing zone (13), a second washing zone (14), and a drying zone (15). 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 (21) for heating water and a tank (22). A first pipe (23) connects the heater and the first water outlet, and a second pipe (24) connects the heater and the tank. An outlet pipe (25) 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.
