In order to study the structure types and deformation characteristics of prefabricated invert arch structure in highway tunnels, firstly, by collecting application cases of different prefabricated tunnel structures at home and abroad. Then, the precast inverted arch structure of the drilling-blasting highway tunnel is optimized and its stress characteristics are studied. According to the section characteristics of the drilling-blasting highway tunnel, taking a highway tunnel project in Gansu Province as an example, the prefabricated invert type of arc-shape and box-shape was designed from the aspects of construction difficulty, construction speed, anti-drainage ability and cost. The influence of the number of invert arch blocks, invert arch thickness and width on the maximum displacement, concrete damage and reinforcement stress of prefabricated box invert structures are analyzed. The results show that the box-type precast invert is a more suitable structure. The box prefabricated invert structure with 7 blocks, upper thickness of 20.cm, lower thickness of 40.cm and width of 1.2 m is the most suitable. The assembled invert structure and the secondary lining structure adjust and improve the tunnel load, and play a significant role in ensuring the stability of the overall supporting structure.