The utility model discloses a large-span steel truss suspension bridge closure device. The large-span steel truss suspension bridge closure device is characterized in that a height lifting device (2) for adjusting vertical errors is arranged on a steel trussed bridge (1) of a closure section and connected with a main cable (3). A length traction device for adjusting longitudinal errors is arranged on the steel trussed bridge (1), and an opposite pulling device (4) for adjusting horizontal errors is arranged on the steel trussed bridge (1) of the closure section. The large-span steel truss suspension bridge closure device can adjust various errors caused in middle closure of a steel truss suspension bridge so as to accurately align at a bolt hole of a closure interface and finish installation of steel trussed bridge rods, and has the advantages of being simple in adjusting method, simple in closure device, short in construction period, high in construction accuracy and wide in application range.