The rock reamer is specially designed for hard formations, with stable working performance. It is stronger than other reamers, minimizing the cost and drilling time. According to the characteristics of the drilling rig and different formation conditions, the appropriate tooth type and bearing structure are selected. The palm tip is widened and thickened with alloy, and the back of the palm is inlaid with anti-wear alloy to reduce wear. In addition, due to the replaceable cutter, it can be used in various ground conditions, realizing quick replacement, saving time and cost consumption