Water tank of hydrogen generator and hydrogen generator

The invention relates to a water tank of a hydrogen generator and the hydrogen generator. The water tank comprises a shell and a cover body, a cavity for containing liquid is formed in the shell, the cover is detachably arranged on the shell, a water tank water supply port is formed in the cover and communicated with the cavity, a water outlet is formed in the shell and communicated with the cavity, a water return port is further formed in the shell, and the water return port is communicated with the water tank water supply port. The water return port is communicated with the cavity, the cover body is provided with an oxygen exhaust port, and the oxygen exhaust port is communicated with the cavity; and the shell and the cover body are provided with at least one arc-shaped part along the section shape in the vertical direction. Compared with the prior art, the hydrogen generator has the advantages that interference with other structures can be avoided through the arc-shaped part, layout of other equipment of t