A washing device, including: a main body having a first end and a second end, the main body defining a first washing zone, a second washing zone and a drying zone from the first end to the second end, the main body having a transporting device to transport an object to be washed from the first end toward the second end so that the object to be washed passes through the first washing zone, the second washing zone, and the drying zone, the first washing zone having at least one first water inlet, the second washing zone having at least one second water inlet; a water system, including a heater, a tank, a first pipe, a collecting structure and a supply pipe, one end of the first pipe being in communication with the water source and an other end of the first pipe being connected to the tank, the tank being in communication with the first water inlet via a supply pipe, the collecting structure being connected to the first washing zone for guiding the waste water from the first washing zone into the tank; a drying system, including an air supplier and at least one venting device, the venting device being arranged at the drying zone of the main body and being connected to the air supplier so as to supply air flow to the drying zone for drying the object to be washed; wherein the water system further includes a first pump in communication with the supply pipe, characterized in that the heater being connected between the water source and one end of the first pipe to heat up water supplied to the tank via the first pipe, the water system further comprising a second pipe, one end thereof being connected to the heater and the other end of the second pipe being connected to the second water inlet of the second washing zone, the collecting structure further being connected to the second washing zone for guiding waste water from the second washing zone into the tank; wherein the water system further includes a filtering device and a second pump, the filtering device being disposed on the supply pipe, the second pump being disposed on the second pipe; and wherein the venting device includes an outer cylinder and an inner cylinder, the inner cylinder is arranged in the outer cylinder and is heteroaxial to the outer cylinder, the inner cylinder is connected to the air supplier, a side of the inner cylinder remote from an inner wall of the outer cylinder is formed with a first air outlet, a side of the outer cylinder closer to an outer wall of the inner cylinder is formed with a second air outlet, the first air outlet and the second air outlet are away from each other, the second air outlet faces the drying zone. a main body having a first end and a second end, the main body defining a first washing zone, a second washing zone and a drying zone from the first end to the second end, the main body having a transporting device to transport an object to be washed from the first end toward the second end so that the object to be washed passes through the first washing zone, the second washing zone, and the drying zone, the first washing zone having at least one first water inlet, the second washing zone having at least one second water inlet; a water system, including a heater, a tank, a first pipe, a collecting structure and a supply pipe, one end of the first pipe being in communication with the water source and an other end of the first pipe being connected to the tank, the tank being in communication with the first water inlet via a supply pipe, the collecting structure being connected to the first washing zone for guiding the waste water from the first washing zone into the tank; a drying system, including an air supplier and at least one venting device, the venting device being arranged at the drying zone of the main body and being connected to the air supplier so as to supply air flow to the drying zone for drying the object to be washed; wherein the water system further includes a first pump in communication with the supply pipe, characterized in that the heater being connected between the water source and one end of the first pipe to heat up water supplied to the tank via the first pipe, the water system further comprising a second pipe, one end thereof being connected to the heater and the other end of the second pipe being connected to the second water inlet of the second washing zone, the collecting structure further being connected to the second washing zone for guiding waste water from the second washing zone into the tank; wherein the water system further includes a filtering device and a second pump, the filtering device being disposed on the supply pipe, the second pump being disposed on the second pipe; and wherein the venting device includes an outer cylinder and an inner cylinder, the inner cylinder is arranged in the outer cylinder and is heteroaxial to the outer cylinder, the inner cylinder is connected to the air supplier, a side of the inner cylinder remote from an inner wall of the outer cylinder is formed with a first air outlet, a side of the outer cylinder closer to an outer wall of the inner cylinder is formed with a second air outlet, the first air outlet and the second air outlet are away from each other, the second air outlet faces the drying zone.