Waste liquid collecting device for liquid chromatograph

The utility model discloses a waste liquid collecting device for a liquid chromatograph, and relates to the technical field of waste liquid collecting devices, a first communicating pipe and a second communicating pipe which are horizontally arranged are respectively arranged at the upper part and the lower part of a bottle body in a penetrating manner, and the other end of the first communicating pipe and the other end of the second communicating pipe are respectively communicated to a balance pipe which is vertically arranged; the top of the balance pipe is opened and provided with a sealing cover, the sealing cover is provided with an air outlet pipe, and the outer side of the air outlet pipe is sleeved with a flexible connecting pipe. Waste liquid can smoothly enter the bottle body, and in addition, the liquid level of the liquid in the bottle body can be more visually observed through the balance pipe. The flexible connecting pipe can extend to the air inducing opening, so that a gas phase in the bottle