The utility model discloses a wind gap off device, including block structure and at least a set of bearing structure, block structure includes interim closure plate and closing plate, interim closure plate one side with bearing structure connect so that set up in the wind gap is pushed down to the closing plate of interim closure plate opposite side, every group bearing structure includes a jack and a straight tube or every group bearing structure includes that a jack and two at least straight tubes connect gradually the straight tube group that forms, the one end of straight tube or straight tube group with interim closure plate is connected, the other end with the jack is connected. The beneficial effect of the utility model as follows: adoption block structure plugs up the wind gap, utilizes bearing structure to exert pressure to block structure, guarantees the tightness of shutoff, and the closing plate can be realized effective sealedly to the wind gap, utilizes the jack stroke to finely tune, and the realization closing plate is sealed with the wind gap, the utility model discloses easy dismounting is swift.