The invention discloses a fire-fighting lance convenient to disassemble in the technical field of fire-fighting lances. The fire-fighting lance comprises a lance body, wherein a mounting plate is arranged at a left end of the lance body, a left end of the mounting plate is movably connected with a connecting plate, stop blocks are arranged at right ends of outer walls of the sides, away from eachother, of two sets of connecting rods, adjusting springs are arranged on inner walls of right sides of connecting grooves correspondingly, left ends of the adjusting springs are attached to outer walls of right sides of the connecting rods correspondingly, limiting blocks are arranged on outer walls of the left ends of the sides, close to each other, of two sets of guide rods, the ends, close to the mounting plate, of the limiting blocks extend to inner cavities of the connecting grooves correspondingly, supporting blocks are moved away in the fire-fighting lance, the supporting blocks do notmake contact with the guide rods, right ends of the guide rods are pressed, the guide rods drive the limiting blocks to rotate away from the left ends of the stop blocks, the connecting rods are ejected out of the connecting grooves through expansion of the adjusting springs correspondingly, and the mounting plate and the connecting plate are disconnected with each other, so that a lance head andthe lance body are separated from each other, and a maintainer can disassemble the fire-fighting lance conveniently.