Liquid level detection device

The utility model provides a liquid level detection device which comprises an outer shell body, a first cavity for containing a filtering solution is formed in the outer shell body, and an exhaust port communicated with the first cavity is formed in the top of the outer shell body; the liquid level switch comprises a liquid level meter main body, a first space is formed in the liquid level meter main body, and the liquid level meter main body penetrates through the top end of the shell body; the feedback assembly penetrates through the top end of the liquid level meter body, one end of the feedback assembly is arranged in the first space, the other end of the feedback assembly is exposed out of the first space, and the joint of the feedback assembly and the liquid level meter body is arranged out of the shell body; during use, flue gas is introduced into the filter solution, and the flue gas passes through the filter solution and then is discharged from the exhaust port; even if the filtering solution becomes