Airtight gate valve

The utility model relates to the technical field of gate valves, and discloses an airtight gate valve which comprises a valve body, and a supporting seat is fixedly installed on the surface of the valve body. A rotating handle is rotated to drive a valve rod to rotate in a valve column, so that a liquid storage block is driven to conduct angle adjustment, repairing liquid flows into the liquid storage block through a liquid guide pipe, when the repairing liquid is full, a leather plug is plugged into the liquid guide pipe to press the leather plug to drive the liquid guide pipe to descend, and therefore a pressure plug is driven to extrude the repairing liquid in the liquid storage block; under extrusion of a pressure plug, repair liquid flows into the flashboard from a permeation hole and then repairs the damaged part of the flashboard, when gas passes through a filter plate, impurities in the gas can be filtered out, a turbine fan is driven to rotate under the pressure of the gas, and therefore a rotating c