The invention discloses a fire-fighting helmet which comprises an outer shell, a heat insulating layer, a buffer layer, a lining layer, a framework and a plurality of buffer units, wherein the outer shell, the heat insulating layer, the buffer layer and the lining layer are sequentially arranged from outside to inside; the heat insulating layer is of an enclosed hollow structure and is in the negative-pressure state; the lower surface of the heat insulating layer is upwardly sunken so as to form a plurality of connecting cavities similar to hemispheres; the buffer layer comprises a buffer body; the buffer body comprises an enclosed container and a plurality of water balls; the container is filled with the water balls; a plurality of moving channels penetrate through the container in a spacing manner; the water balls comprise hollow silica-gel balls and distilled water accommodated in the silica-gel balls; a plurality of pressure springs are arranged on the periphery of the container ina spacing manner; the framework is integrally formed by intersecting a plurality of long-strip metal sheets and fixed to the lower ends of the pressure springs; each buffer unit comprises a clampingball, a connecting column and a pair of swinging rods; each clamping ball is accommodated in the corresponding connecting cavity; the upper end of each connecting column is rotationally connected withthe corresponding clamping ball; and the upper ends of each pair of swinging rods are hinged to the lower ends of the corresponding connecting columns. The fire-fighting helmet disclosed by the invention has the beneficial effect of remarkably improving the external-force impact absorbing performance.