In this study, the effect of the cutter tip shape on the rock crushing mechanism was investigated using the two-dimensional particle flow code (PFC2D). For this purpose, two numerical models with different tensile strengths of 5MPa and 25MPa were constructed and subjected to confining stresses of 5MPa and 20MPa, respectively. 8 cutters with different geometric shapes hit the rock surface at a rate of 0.02m/s until they penetrated 4mm into the rock. A total of 16 simulations were performed. The rock under the cutter shows three different mechanical behaviors, which are: a fractured area under the cutter, a plastic area with localized cracks under the fractured area, and an elastic area. When the rock tensile strength is 5MPa, the fracture stress from the concave-shaped blade is the lowest and the number of cracks is the highest. This means that in rock with a strength of 5MPa, the cutter shape has a great effect on the fracture stress and the extent of rock fracture. When the tensile strength of the rock is 25MPa, the U-shaped blade causes the most failure, but the failure stress of the blades is the same. This means that in rock with a strength of 25MPa, the cutting edge shape does not affect the failure stress but controls the fracture width. In general, the concave and U-shaped blades with the lowest stress consumption cause the most failure in rock with tensile strengths of 5MPa and 25MPa. With increasing tensile strength, the failure stress increases while the fracture width decreases.