The invention discloses a built-in balloon type impacting preventing device based on a prestressed reinforcement. The built-in balloon type impacting preventing device based on the prestressed reinforcement comprises an outside steel wallboard, a lining steel wallboard, a plurality of prestressed ribs and and upper buckling steel plates, wherein the bottom ends of the plurality of prestressed ribs are anchored to the bottom of the outside steel wallboard, and the upper buckling steel plates are buckled outside the outside steel wallboard, wherein the lower parts of the upper buckling steel plates are stretched through the plurality of prestressed ribs; an impacting preventing chamber is formed between the outside steel wallboard and the lining steel wallboard; a counter weight cushion layer is arranged at the bottom of the impacting preventing chamber; a plurality of rubber balloons are filled in the impacting preventing chamber at the upper part of the counter weight cushion layer; the lining steel wallboard is positioned outside a device to be protected; an energy absorbing cushion is arranged between the lining steel wallboard and the device to be protected; and the outside steel wallboard, the lining steel wallboard and the energy absorbing cushion layer are arranged on the same plane based on the same vertical height. The built-in balloon type impacting preventing device based on the prestressed reinforcement is reasonable in structural design, low in input cost, convenient to construct and long in service life, has good usage effect, and is capable of effectively solving the defects and shortcomings of traditional impacting preventing facilities of transportation means of being relatively high in input cost, relatively short in service life and relatively low in effect of impacting preventing.