The invention relates to the technical field of rolling gates, and discloses an anti-falling system of a rolling gate. The anti-falling system of the rolling gate includes an upper limiting switch arranged on a door leaf and an anti-falling device cooperated with the upper limiting switch; the anti-falling device includes a base and a wedge disc which is rotatably assembled on the base; and the base is provided with a supporting part for supporting the wedge disc, the wedge disc has a supporting position for being supported on the supporting part to support the rolling gate to prevent the rolling gate from falling down and a release position for avoiding the supporting part to release the rolling gate in the rotation stroke, and the wedge disc cooperates with the upper limiting switch to disconnect the upper limiting switch when the wedge disc is at the supporting position. When the wedge disc is at the supporting position, the wedge disc can disconnect the upper limiting switch so asto disconnect a circuit of the anti-falling system, even when a brake device fails or a chain drive device fails, a motor cannot work due to the circuit disconnection, the wedge disc supports the rolling gate at the same time, the rolling gate cannot fall, the safety hazard of falling of the rolling gate is eliminated, and causing of casualties and property damage is avoided.