The invention provides a stone crusher for mine construction. The stone crusher comprises a machine body, a plurality of supporting legs connected to the lower end of the machine body, a feeding funnel which is connected to the upper end of the machine body in a penetration manner, discharging openings which are connected onto side walls of two ends of the machine body in a penetration manner, a first speed-reducing motor which is connected onto an inner bottom wall of the machine body through a first bracket, and a rotating shaft which is connected onto a rotary shaft of the first speed-reducing motor; and the upper end of the rotating shaft is in rotary connection to an inner top wall of the machine body. By adopting the stone crusher provided by the invention, the disadvantages in the prior art are overcome; the stone crusher is reasonable in design and compact in structure; ores are cracked through crushing rods, the ores are ground through crushing rotary rollers, the ores are ground through a trapezoidal pressing block and the ores are ground again through saw teeth, so that the aim of crushing and smashing the ores is realized through one device; and the working efficiency is improved and the cost is saved.