High altitude area road subgrade structure and construction method thereof

The invention discloses a roadbed structure of a road in a high-altitude area. The roadbed structure sequentially comprises a lower base layer, a waterproof heat-conducting layer and an upper base layer from bottom to top, a frost heaving prevention device is arranged on the upper base layer slope and comprises a heat collection box, a heat storage material tank is arranged in the heat collection box, a heat pipe is further arranged in the heat storage material tank, an evaporation section of the heat pipe is located in the heat storage material tank, and a transition section and a condensation section of the heat pipe penetrate through the closed end of the heat storage material tank and the heat collection box and are inserted into the upper base layer after being bent. The heat storage material tanks are connected with branch air pipes, the branch air pipes on the heat storage material tanks are connected with a main air pipe, and the main air pipe penetrates out of the heat collection box and extends to a