Defoaming device of dish washing machine and dish washing machine

The defoaming device comprises a porous part, the porous part comprises a plurality of first defoaming holes, the porous part is arranged in a washing cavity in the dish washing machine, the porous part is located on a foam movement path, foam is filtered through the first defoaming holes, and liquid passes through the first defoaming holes. According to the dish washing machine, spraying liquid for washing dishes is sprayed upwards to the dishes, then the spraying liquid is mixed with greasy dirt to be gathered to the bottom of the washing cavity under the action of gravity, and when the gathered spraying liquid generates more foam, the foam flows in the same direction along with water and is discharged out of the washing cavity to the outside of the dish washing machine under a preset movement path. The multi-hole part is arranged in the washing cavity of the dish washing machine and arranged on the foam movement path, so that along with flowing of water, foam collides with the multi-hole part, then the foa