The invention discloses a mine tunnel supporting device, comprising an arched frame. A protective net is movably connected in the arched frame. The arched frame includes first modules, the top of eachfirst module is movably connected with a second module, the tops of the second modules are movably connected with a third module, and the top of the third module is movably connected with roof protection devices. Each roof protection device includes a threaded rod, a hexagonal slot is arranged in the bottom of the threaded rod, and a lower roof is arranged on the top of the threaded rod. A firstgroove is arranged in the middle of the bottom of each lower roof. Second grooves are arranged on the front and rear sides of the bottom of the lower roof, and the lower end of each second groove is fixedly connected with a stud. A first through hole is arranged in the middle of each stud, and the lower end of each stud is movably connected with a first screw. The protective net includes steel wires, a first connecting block is arranged at each of the T-shaped junctions of the steel wires, and a second connecting block is arranged at each of the cross junctions of the steel wires. The mine tunnel supporting device is convenient to assemble and disassemble during use without need for secondary processing, is highly compatible with the tunnel shape, and has a function of simple pipeline laying in jumper slots.