The utility model relates to a closed valve, in particular to a two-way-opened type single-side-controlled gate valve for a fan. The technical problem that the existing single-blade gate valve is not suitable for large pipes is solved. According to the technical scheme, the two-way-opened type single-side-controlled gate valve for the fan comprises a gate valve box body and a shaft, wherein two sides of the shaft are fixed on a left side plate and a right side plate of the gate valve box body; an end of one side of the shaft is connected with a power mechanism; straight toothed spur gears are respectively arranged on the tails of the left side and the right sides of the shaft; the straight toothed spur gear arranged on the tail of the left side of the shaft is connected with a straight toothed spur gear arranged on the tail of one side of a left-handed screw; and the straight toothed spur gear arranged on the tail of the right side of the shaft is connected with a straight toothed spur gear arranged on the tail of one side of a right-handed screw. The two-way-opened type single-side-controlled gate valve for the fan has the advantages that the two-way-opened type single-side-controlled gate valve is simple in structure and convenient to operate; the manufacturing cost can be reduced; gates of the gate valve are symmetrically distributed on a large pipe; and load of related equipment can be reduced.