A combined-structure overpass is disclosed. The overpass comprises straight lanes from north to south in the first layer, sidewalks from north to south in the first layer, turning lanes in the second layer, straight lanes from east to west in the third layer and sidewalks from east to west in the third layer. Slope lanes are disposed to lead to the layer of the turning lanes and the layer of the straight lanes from east to west and the sidewalks from east to west respectively and are communicated with each other. The turning lanes in the second layer are provided with an annular turning round passing zone in the intersection segment of the straight lanes from north to south in the first layer as well as the sidewalks from north to south in the first layer and the straight lanes from east to west in the third layer as well as the sidewalks from east to west in the third layer. Compared with the prior art, the overpass is characterized by low manufacturing cost, short on-site construction time, small occupied space, concise traffic routes and capability of making the traffic convenient because of no long-winded approach bridges, and dismounting convenience.