The utility model discloses a disassembly -assembly device for roller of coal mine machine relates to colliery mechanical maintenance equipment technical field. It is including fixed drive block, activity drive block, dual drive axle mechanism, the upper portion left surface of fixed drive block and the upper portion right flank of activity drive block are the wedge, dual drive axle mechanism includes the drive lead screw and drive down the lead screw to be driven the lead screw on, and all is connected with fixed drive block pivot with the left end that time drives the lead screw, on drive the lead screw with drive down the lead screw all pass movable drive block and with the drive block screw -thread fit that moves about, on drive the lead screw and all be connected with the base pivot with the right -hand member that drives down the lead screw, on drive the lead screw and the right -hand member portion that drives down the lead screw all installs the gear, the gear reducer that the right -hand member of base was installed driving motor and was connected with the driving motor output, gear reducer's output gear and last drive lead screw and the gear that drives the lead screw down all mesh, the commutator who is used for the controlled drive motor switching -over is installed to the trailing flank of base. The utility model discloses its structure is exquisite, and occupation space is little, and the operating torque is big, has improved cylinder dismouting efficiency.