Passive safety system based on zero-gravity seat

The invention relates to a passive safety system based on a zero-gravity seat, the passive safety system comprises a backrest quick return mechanism and a backrest position sensor control assembly which are mounted on a backrest angle adjuster, and the backrest position sensor control assembly comprises a switch pressing sheet fixedly connected to the backrest angle adjuster, a position sensor fixedly connected to a backrest connecting plate, and a control module fixedly connected to the switch pressing sheet. The switch pressing piece synchronously rotates along with the backrest angle adjuster, the position sensor is installed on a movement track line of the switch pressing piece, the position sensor is electrically connected with an exploder of the backrest quick return mechanism, and when the backrest angle adjuster drives the switch pressing piece to make contact with a normally-open contact of the position sensor, the position sensor transmits a communication signal to the exploder. The exploder can exp