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The first to realize continuous operation and once for all during the whole bridge-erecting process;one of single bridge-erecting machines with functions in the country;adopting walking type complete through-hole so that the complete machine is greatly shortened in length,its deadweight is reduced and the construction load is thus reduced to the maximum extent. The main girder adopts the structure of triangular space truss detached pin-connected main girder to increase the strength and rigidity of the complete machine. Possessing three innovation technologies and integrating right angle,any skew angle,small-radius curve and large-slope bridge,the complete machine operates more flexibly and conveniently. The main girder itself is provided with upper travel track, so it it not necessary to pave travel track for overhead traveling crane and longitudinal moving cart, which saves customers substantive expenses on auxiliary materials and reduces construction perion and economic cost. JQG 320t/60m highway bridge-erecting machine researched and developed recently is a large-tonnage and large-span highway bridge-erecting macine in china which is a new technical equipment added for domestic highway&bridge construction.