Automatic liquid supplementing device

The utility model provides an automatic liquid supplementing device which comprises a dipping tank, a liquid supplementing tank and a liquid level meter, a dipping cavity is formed in the dipping tank, the upper end of the dipping cavity is open, a catalyst module can be placed in the dipping cavity to achieve dipping, and dipping liquid is contained in the dipping cavity; the liquid supplementing tank is communicated with the dipping cavity through a liquid supplementing pipe and used for supplementing liquid to the dipping cavity, and a first valve is arranged on the liquid supplementing pipe; the liquid level meter is installed in the dipping cavity and used for monitoring the liquid level in the dipping cavity, and when the liquid level is lower than a set value, the first valve is opened, and liquid is supplemented to the dipping cavity. The automatic liquid supplementing device disclosed by the utility model is compact in structure, stable and reliable to use, convenient and labor-saving to operate, hig