NOVELTY - A braking energy recovering device comprises a wheel (1); a car axle (2); a machine electric control unit (7); a vehicle braking energy recovering generating system; a hydrogen and oxygen generating, storing and supplying system; a hydrogen and oxygen generating electric control unit (11); and a generator (6) having a generator belt wheel, generator excitation terminal, a generator leading-out terminal, a transmission belt wheel connected to the car axle by a spline, and a transmission belt between the transmission belt wheel and generator belt wheel.    USE - A braking energy recovering device for generating hydrogen and oxygen in vehicle.    ADVANTAGE - The device can recycle the brake energy water electrolysis to produce hydrogen and oxygen.    DETAILED DESCRIPTION - A braking energy recovering device comprises:    (A) a wheel (1);    (B) a car axle (2);    (C) a machine electric control unit (7);    (D) a vehicle braking energy recovering generating system;    (E) a hydrogen and oxygen generating, storing and supplying system;    (F) a hydrogen and oxygen generating electric control unit (11);    (G) a generator (6) having a generator belt wheel, generator excitation terminal, a generator leading-out terminal, a transmission belt wheel connected to the car axle by a spline, and a transmission belt between the transmission belt wheel and generator belt wheel;    (H) a rectification and stabilivolt module;    (I) a hydrogen and oxygen generating machine;    (J) a hydrogen and oxygen generating electric relay fixed between the rectification and stabilivolt module;    (K) a hydrogen and oxygen generating machine (15);    (L) a generator leading-out terminal connecting with the rectification and stabilivolt module by lead;    (M) a hydrogen outlet;    (N) a hydrogen outlet solenoid valve;    (O) a hydrogen pressure sensor fixed on the hydrogen storing tank;    (P) an oxygen outlet solenoid valve;    (Q) a oxygen pressure sensor fixed on the oxygen storing tank.    The hydrogen and oxygen generating electric control unit is connected with machine electric control unit through shielded cable to achieve braking signal and retarder signal. The control unit is connected with the rectification and stabilivolt module through shielded cable to achieve voltage signal; and connected with the generator excitation terminal through shielded cable. The hydrogen and oxygen generating electric control unit is connected with the oxygen pressure sensor and hydrogen pressure sensor through shielded cable to achieve the oxygen storing tank pressure signal and hydrogen storing tank pressure signal; and is connected with the hydrogen and oxygen generating electric relay through shielded cable. The hydrogen and oxygen generating electric control unit is connected with the hydrogen outlet solenoid valve and the oxygen outlet solenoid valve through shielded cable. An INDEPENDENT CLAIM is included for a method of recycling brake energy-hydrogen, and oxygen as oxidizing agent.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of a braking energy recovering device.    Wheel (1)    Car axle (2)    Generator (6)    Machine electric control unit (7)    Hydrogen and oxygen generating electric control unit (11)