The invention relates to a fire-extinguisher placing box. The fire-extinguisher placing box comprises a box body, a sealing plate and a rotary disc, wherein the rotary disc is provided with a placing assembly; the placing assembly is movably connected with at least one locking tongue; the box body is internally provided with a locking fastener; the rotary disc is provided with a weight sensor; the sealing plate is provided with a display panel; a first baffle is provided with a power supply module; and the locking fastener is internally provided with a circuit breaker. The fire-extinguisher placing box has the advantages that real-time weighing is carried out on a fire extinguisher by the weight sensor arranged at the bottom end of the rotary disc, and weight reading and displaying are carried out by the display panel, so that the error caused by weighing of an existing electronic scale and the workload caused by weighing are effectively reduced, and the weighing efficiency is greatly improved; the existing capacity of the fire extinguisher is accurately evaluated by displayed values to judge whether the fire extinguisher can be continuously used, so that the potential hazard of fire-fighting safety can be reduced, simultaneously the working error rate of workers can be reduced, and the overall efficiency of fire-fighting work can be improved; and an empty tank is alarmed by an alarming device.