The invention provides a throwable wireless sensor node for an emergency scene and a using method. The wireless sensor node comprises a tumbler-shaped protective shell with an opening in the top end,a waterproof top plate is movably arranged at the top end of the protective shell, a water retaining ring and a sensing unit are fixedly arranged on the waterproof top plate, and a mounting hole communicated with the interior of the protective shell is formed in the middle of the waterproof top plate; a power supply groove, a fixing clamp, a PCB clamping groove and an elastic supporting module arefixedly arranged in the protective shell. The power supply groove and the fixing clamp are matched with the power supply module. The PCB clamping groove is matched with the PCB; and the protective shell is movably connected with the top protective cover through an elastic supporting module. According to the wireless sensor node, the arrangement efficiency of the wireless sensor nodes is improvedby adopting a throwing arrangement mode; the tumbler-shaped design is adopted, so that the directivity of the sensing unit and the antenna can be ensured during scattering; and a waterproof and fireproof shell material is adopted, so that the adaptive performance of the measurement environment of the wireless sensor node can be improved.