Bidirectional ventilating fan

The invention belongs to the technical field of ventilating fan equipment, and especially relates to a bidirectional ventilating fan. The bidirectional ventilating fan comprises forward direction fan blades and reverse direction fan blades installed on a rotating shaft, the forward direction fan blades and the reverse direction fan blades are fixed on a fan blade fixing part, a separator plate divides the rotating shaft into two parts, a gear D and a gear E are fixed on the rotating shaft, the gear E is engaged with a gear A, two ends of a connection shaft are respectively fix with the gear A and a gear B, the gear B and the gear D are engaged with a gear C fixed on a fixed shaft, a steering device is connected with a bearer through a reinforcing rib, a torsion spring is fixed on a fixed mount, a pedestal clamp which is inside provided with the torsion spring is fixed on the lower end of the bearer, a motor is fixed on the bearer, a plug drawing ring is fixed on a plug, the plug is connected with the motor th