Highway roadbed structure capable of preventing roadbed softening

The utility model discloses an expressway roadbed structure capable of preventing roadbed softening. The expressway roadbed structure comprises a supporting base, a supporting structure and a collecting structure. The supporting structure comprises supporting bodies, a supporting top face is arranged at the top end of the supporting base, and the supporting bodies are evenly fixed between the supporting top face and the supporting base. The supporting force of the supporting top surface is improved through cooperation of the supporting body and the connecting plate, the supporting body is placed more firmly through cooperation of the auxiliary supporting column and the fixing block, the supporting force of the supporting top surface is improved by adding filler into the concrete filler to be matched with the auxiliary supporting column, and the situation that the supporting top surface is softened after being used for a long time, and consequently road surface driving is inconvenient is avoided; the firmness