The invention discloses a rock three-axis fracturing device. The rock three-axis fracturing device comprises a bracket, a main cavity, a pushing and conveying mechanism, horizontal force application mechanisms, rotary pressing rods and a top force application mechanism, wherein the main cavity is fixedly connected onto the bracket; the main cavity is provided with a communicating cavity for containing a rock to be detected; the pushing and conveying mechanism is arranged at the bottom of the bracket; the pushing and conveying mechanism comprises a first hydraulic cylinder and a supporting plate; the two horizontal force application mechanisms are fixedly connected onto two side faces, which are vertical to each other, of the main cavity respectively; each horizontal force application mechanism comprises a fixed block and a second hydraulic cylinder; the top of a piston rod of each second hydraulic cylinder is fixedly connected with a pressing block and each pressing block is provided with an electromagnetic sensor; the two rotary pressing rods are arranged on side faces, which are opposite to the horizontal force application mechanisms, on the main cavity; each rotary pressing rod comprises a screw rod and a handle; the top force application mechanism comprises a top plate, a third hydraulic cylinder and a pressing plate; the top plate is arranged at the top of the main cavity and the pressing plate is fixedly connected with the top of a piston rod of the third hydraulic cylinder.