Stone crusher for tunnel construction

The utility model relates to the technical field of crushing machinery, in particular to a stone crusher for tunnel construction, which comprises a protective box arranged on a rack, a crushing mechanism is arranged in the protective box, and a feeding mechanism is arranged at the side end of the protective box; the crushing mechanism comprises a first-stage crushing mechanism, a second-stage crushing mechanism and a driving linkage mechanism, the second-stage crushing mechanism is located under the first-stage crushing mechanism, the first-stage crushing mechanism comprises two first-stage crushing rollers which are rotationally installed in the protection box side by side, and the second-stage crushing mechanism comprises two second-stage crushing rollers which are rotationally installed in the protection box side by side; the feeding mechanism comprises a lifting mechanism, a stock bin and an overturning driving mechanism. The stone crushing device is simple in structure, stone can be conveniently and effi