Curtain grouting drilling backwater drainage device

The utility model discloses a curtain grouting drilling backwater drainage device, relates to the technical field of geotechnical engineering construction, and solves the problem that in the use process of a curtain grouting drilling backwater directional drainage device in the prior art, drilling backwater with rock powder and drilling slag easily blocks a drainage connecting pipe or a drainage hose. According to the technical scheme, the curtain grouting device is characterized by comprising a heightening pipe and a cavity, a filter screen dividing the interior of the cavity into a stock solution chamber and a clean solution chamber is arranged in the cavity, a solution inlet pipe is arranged on the stock solution chamber, a solution outlet pipe is arranged on the clean solution chamber, the solution inlet pipe of the cavity is connected with the heightening pipe, and the heightening pipe is connected with the upper end of a curtain grouting pipe. Through the structure, when a curtain grouting drilling proc