Drainage device and using method thereof

The invention relates to the technical field of liquid conveying, and discloses a drainage device and a using method thereof.The drainage device comprises an outer pipe and a driving mechanism, a containing cavity penetrating to the two ends of the outer pipe is formed in the outer pipe, a plurality of control mechanisms are evenly distributed in the outer pipe in the length direction of the outer pipe, each control mechanism comprises an outer frame, and a pipe body is arranged in the outer frame in a vertically movable mode; the driving mechanism is used for driving the pipe bodies to move up and down, and a flexible pipe is connected between every two adjacent pipe bodies. The drainage device is horizontally mounted; in an initial state, all the pipes are positioned at the lower end of the control mechanism; after the water flow enters, the driving mechanism in the first control mechanism lifts the pipe body to the upper end of the control mechanism, and the pipe body and the pipe body, located at the bott