The invention discloses a multistage ore crushing device for mining. The multistage ore crushing device comprises a shell, wherein crushing rollers are arranged in the shell; a screen plate is arranged under the crushing rollers; a crushing barrel is arranged under the screen plate; a transverse plate is arranged under the crushing barrel; a screen mesh is arranged in the middle of the transverseplate; through grooves are formed in symmetrical positions of the two sides of the transverse plate; inner walls of the through grooves are hinged with bounced ejection plates through articulating shafts. According to the multistage ore crushing device for mining disclosed by the invention, atomizing sprinkler heads are arranged, so that dust produced in a pulverizing process is subjected to settlement so as to avoid diffusion of the dust and pollution to a working environment; due to the arrangement of the crushing rollers and the movable screen plate, ores are repeatedly crushed so as to ensure a crushing effect, and the blocking of the screen plate is also avoided at the same time; the bounced ejection plates and material guiding plates of which the lower surfaces are provided with crushing teeth are arranged, so that the ores are thrown to the lower surfaces of the material guiding plates and outer walls of the crushing barrel through the bounced ejection plates, so that the ores are struck and crushed, and the crushing effect is enhanced.