The invention discloses a bailey piece detachable steel trestle construction method. The method includes the steps of a, trestle upright
pile foundation construction, b, first-layer earth excavation,c, elevation
pilot testing and
steel tube upright treatment, d, profile steel girder installation, e, bailey piece installation and fixing, f, secondary beam installation, g, vehicle traveling bridgedeck slab installation, h, anti-skid reinforcing rod and
protective barrier welding, i, trial run conduction, acceptance check and use, j, second-layer earth excavation, k, next-layer trestle repeatedinstallation, l, horizontal pull rod and
diagonal bracing installation, m, second trail run conduction, acceptance check and use, and n, maintenance and detachment. By the adoption of the construction method,
assembly and disassembly are convenient, and
assembly and disassembly efficiency is improved; and meanwhile, the recycling rate is increased, waste is reduced, and the manufacturing cost isreduced.