Water injection heat preservation bowl

The utility model discloses a water injection heat preservation bowl which comprises an inner bowl and an outer bowl, the inner bowl is buckled on the outer bowl, the edge of the inner bowl is attached to the edge of the outer bowl, a cavity for containing hot water is formed between a bowl body of the inner bowl and a bowl body of the outer bowl, the outer bowl is provided with a drainage channel communicated with the cavity, and the drainage channel is communicated with the cavity. The outlet of the drainage channel is connected with a nut and is provided with an external thread; when the bowl is used, the nut is opened to adjust the air pressure in the cavity, so that the air pressure in the cavity is consistent with the external air pressure, and the inner bowl and the outer bowl are convenient to disassemble; meanwhile, hot water can be injected into the cavity or discharged through the drainage channel, and the situation that the inner bowl and the outer bowl need to be detached when water is changed is