Gate device for water conservancy project and using method of gate device

The invention relates to the technical field of water conservancy projects, in particular to a gate device for water conservancy projects and a using method thereof.The gate device comprises a lifting mechanism which comprises an outer protection box with the lower end open, two lifting assemblies symmetrically arranged in the outer protection box and a connecting plate arranged below the lifting assemblies; the gate mechanism comprises a first gate, a second gate arranged below the first gate and a movable plate arranged on one side of the lower end of the first gate, and the upper end of the first gate sleeves the inner side of the outer protective box in a sliding manner and is fixedly connected with the connecting plate; the lifting assembly comprises a fixed wheel set, a movable wheel set, a steel wire rope and a winding roller, the steel wire rope is matched with the fixed wheel set and the movable wheel set in a vortex line shape, and each circle of steel wire rope is wound with a fixed free wheel and