The invention discloses a road crossing device for power grid construction. The road crossing device comprises vertical insulating members, vertical supporting members, an insulating crossbeam and wire passing wheels. Each side of the road crossing device comprises at least one vertical insulating member which is vertically overlapped and supported on the corresponding vertical supporting member. The tops of the vertical insulating members on two sides are connected through the insulating crossbeam. The wire passing wheels are mounted at the top of the insulating crossbeam. The vertical insulating members and the insulating crossbeam are formed by assembly of fiberglass epoxy resin tubes filled with foam inside. The vertical insulating members and the insulating crossbeam are formed by assembly of the fiberglass epoxy resin tubes filled with the foam inside, so that the defects of conventional materials such as moso bamboos, China firs and steel tubes in current crossing construction are overcome; new portable high-strength insulating materials are adopted, the weight is reduced to the greatest extent on the condition that strength requirements are met, and accordingly, transporting and mounting under bad conditions are facilitated.