The invention discloses a comprehensive utilization device for renewable energy feedback of a rail transit vehicle. The comprehensive utilization device comprises a dynamic power grid, a power circuit and a traction power grid, wherein the power circuit comprises a DC/AC conversion circuit and a DC/DC conversion circuit, the dynamic power grid is connected with a first end of the DC/AC conversion circuit by a buck transformer, a second end of the DC/AC conversion circuit is connected with a first end of the DC/DC conversion circuit, a second end of the DC/DC conversion circuit is connected with the traction power grid, the DC/DC conversion circuit is a bidirectional DC/DC conversion circuit, the device also comprise an energy storage module for receiving electric energy, and the energy storage module is connected with the first end of the DC/DC conversion circuit and used for receiving a renewable energy source transmitted from the traction power grid. By the comprehensive utilization device, the voltage of the traction power grid for trail transit can be stabilized, meanwhile, residual regenerative power can be stored and fed back to the traction power or the dynamic power grid, and the power supply quality of the traction power grid is improved.