Drainage structure for dish washing machine

The utility model relates to a drainage structure for a dish-washing machine, the dish-washing machine comprises a water tank and a drainage cavity, the drainage cavity and the water tank are of an integrated structure, the lower end of the drainage cavity is provided with a first connector and a second connector, an ascending water channel and a descending water channel which are communicated are arranged in the drainage cavity, and the ascending water channel and the descending water channel form an inverted U-shaped water channel. The upstream water channel is connected with a first connector, the downstream water channel is connected with a second connector, the first connector is communicated with the water tank through a water inlet pipe, the second connector is connected with a drainage pipe, and a ventilation structure communicated with the outside is arranged on the cavity wall of the drainage cavity. The drainage cavity integrally formed with the water tank is arranged on the water tank, drainage op