The present invention relates to a rear bumper reinforcement structure of a vehicle capable of protecting a vehicle body in case of an offset collision at the rear of the vehicle, a bumper cover 100 provided with an impact absorbing material 110, and the bumper cover ( A reinforcing bracket 120 coupled to support 100), a back panel 200 bonded to an upper portion of the bumper cover 100 and an end portion 130a of the trunk floor 130, and bent and coupled to the top of the back panel. In the rear bumper structure of a vehicle composed of a striker reinforcing member 150, an upper end is joined to the striker reinforcing member 150 and is bent in a step shape downward, so that the lower end is the back panel 200 and the trunk. A horizontal reinforcing panel 210 that is joined between the ends 130a of the floor 130 is additionally configured to prevent a neck phenomenon by reinforcing the lower end of the bumper, and to provide support stiffness against an offset collision from the rear. Since it can be improved, it is an invention having the effect of protecting the passengers of the vehicle in case of a rear offset collision.
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