The invention relates to a braking energy recovery system for an electric vehicle, comprising a three-phase staggered two-way half-bridge circuit, a gear selection circuit, a sampling hold circuit, a digital chip, a voltage sampling circuit, a current sampling circuit and a driving circuit which are sequentially connected. Two-way half-bridge DC/DC converters are connected in parallel, the three-phase staggered two-way half-bridge circuit serves as a main circuit topology of the system, high and low levels are output through an I/O port to control the switching-on/off of relays so as to select different power requirement gears, and finally, the purpose of recovering the braking energy of motors with different output power is realized. According to the invention, the reliability of the device is improved, current ripples are reduced, and the volume of inductors and the capacity of capacitors are reduced, so that the device is easier to realize; the system can be used for multiple DC motors with different output power requirements; the system can effectively prevent current from being out of control under fault conditions so as to quickly finish overcurrent protection; and in addition, a three-phase staggered DC/DC converter system and an active inverter system are consistent in structure, thereby being favorable for realizing a modular structure of an electric vehicle system.