The invention discloses an anti-explosion valve capable of bidirectionally protecting large air volume. The anti-explosion valve comprises a valve frame assembly and a group of valve blade assemblies;the valve frame assembly comprises a rectangular frame defined by an upper end plate, a lower end plate, a left end plate and a right end plate, and two baffles arranged at the front-back symmetricalpositions of the upper end plate and the lower end plate correspondingly; the valve blade assembly comprises shafts, valve blades, first rotary positioning pieces, connecting rods, second rotary positioning pieces, positioning bolts, springs and positioning blocks; the shafts are distributed in the rectangular frame at equal intervals, the two ends of each shaft penetrate through the opposite positions of the left end plate and the right end plate respectively, the valve blades are arranged between the left end plate and the right end plate and connected with the shafts, the first rotary positioning pieces are vertically arranged on the surface of one side of the rectangular frame and located between the shafts and the valve blades, the connecting rods are connected with the first rotarypositioning pieces, the second rotary positioning pieces are arranged on the other side of the rectangular frame and located between the shafts and the valve blades, the positioning bolts are arrangedon the second rotary positioning pieces, one ends of the springs are connected with the tensioning bolts, the other ends of the springs are connected with the positioning bolts, and the positioning blocks are arranged above the second rotary positioning pieces and make contact with the upper side faces of the second rotary positioning pieces.