Equipment for cleaning well casing in underground water environment monitoring well

The invention discloses equipment for cleaning a well casing in an underground water environment monitoring well. The equipment comprises an auxiliary part and a main cleaning part, wherein the auxiliary part is located on the ground and can pump out part of underground water in a well and sewage generated when the inner wall is cleaned, and meanwhile needed water is provided for cleaning the inner wall of a well casing; the auxiliary part and the main cleaning part are connected through a steel wire rope on a winding shaft, the steel wire rope slowly moves the main cleaning part downwards to a well mouth to enable the main cleaning part to enter a well, then the main cleaning part provides power, the steel wire rope serves as a protection rope to move downwards along with the main cleaning part, and under the special condition that the main cleaning part does not have electricity, the steel wire rope contracts to pull out the main cleaning part. What is guaranteed is that dirt of the cleaned casing pipe cann