The invention discloses a water adding device for a cooking machine, and belongs to the technical field of cooking machines. The device relates to the water adding device for the cooking machine comprises a casing, an opening is formed in the top of the casing, a material adding device is rotatably connected with the opening through a rotating shaft, the front surface of the casing is hinged witha door panel through a hinge, the inner wall of the bottom of the casing is connected with a heating plate, the upper portion of the heating plate is provided with a pot body, the top of the pot bodyis covered with a lid, a limiting hole is formed in a longitudinal outer side wall, near the material adding device, of the casing, a water injection straight pipe is inserted into the limiting hole,one end, penetrating through the limiting hole, of the water injection straight pipe is located above the pot body, a fixing plate is connected to one end, away from the casing, of the water injectionstraight pipe, the fixing plate is provided with a first fastening ring, and the outer side wall, adjacent to the material adding device, of the casing is sequentially connected with two electric telescopic rods and a fixing seat in the vertical direction. The device has the advantages of simple structure and convenient operation, achieves an automatic water adding function, and effectively controls the amount of water added.