The invention discloses a dry smashing device used for food safety inspection. The dry smashing device comprises a shell, a heating cavity and a heat exchange cavity, a grinding base is arranged at the upper portion of the interior of the shell, an annular cavity is formed in the grinding base, a rotating shaft and a grinding shaft are arranged between front and back side walls of the shell, a heating cavity is arranged on the right side of the shell, the heating cavity is internally provided with an inner shell, a heat preservation cavity, an air blower, a heating pipe, an air inlet hole andan air outlet hopper, a smashing cavity is arranged at the lower end of the grinding base, a fixed blade and a discharging opening are arranged in the smashing cavity, the shell is internally providedwith a motor, a stirring rotating shaft, a rotating blade and an arc-shaped discharging blade, the right wall of the shell is provided with a heat exchange cavity, and a spiral pipe is arranged in the heat exchange cavity. By means of the dry smashing device, the sample drying efficiency is improved through drying of the heating cavity, the machining efficiency is improved through grinding and cutting smashing repeated machining, meanwhile, through the design of the heating cavity and the heat exchange cavity, the energy resource using rate is improved, and energy conservation and environmental protection are achieved while the machining efficiency is stably improved.