The invention discloses a bolt connection device. According to the device, based on an existing bolt connection structure, two layers of conical pin sleeves are added. The conical pin sleeves not onlycan withstand the shear force, but also can increase resistance to loosening in the axial direction. During bolt connection, the pin sleeve structure is adopted and is capable of transmitting rotational torque as compared to a common bolt connection structure. Bolts are protected against the shear force. The axial resistance to loosening of the bolt connection is improved, so that the axial connection of connected parts is reliable. By the adoption of the bolt connection device, the cost is low, and the overall maintenance-free purpose is realized. A shear pin, a shear key and a terminal facetooth structure are high in processing cost, it is difficult to disassemble and assemble a shear pin structure, and the maintenance and repair cost is high. The novel bolt connection mechanism can realize the overall maintenance-free purpose.