The invention discloses a rear bumper installing support convenient to install. The rear bumper installing support convenient to install comprises a support body, an air bag, a first installing plate, a second installing plate, a second fixing rod, a second installing hole, a second switch, an air bag exit, a first fixing rod, a first installing hole, a first switch, a gas pipe, a second electromagnetic valve, a gasholder, a piston and an electric telescopic rod. The air bag exit is arranged in the middle of the support body, and the air bag is arranged in the air bag exit; the first fixing rod is arranged at one side of the air bag exit, and the first installing hole is formed in one end of the first fixing rod; the first switch is arranged at one side of the first installing hole, and the second fixing rod is arranged at the other side of the air bag exit; and the second installing hole is formed in one end of the second fixing rod. According to the rear bumper installing support convenient to install, not only can a vehicle rear bumper be installed, but also the vehicle can be secondarily protected against destroying when the vehicle is subjected to collision, life safety of drivers and passengers are protected, damage strength of the vehicle is reduced, and loss is reduced.