The invention relates to a unit and a process for remote maintenance, in particular to pipe shearing remote maintenance unit and process in deep-well radiation environment. The unit comprises a long-handle tool, a monitoring tool, a display device and a lifting device. The long-handle tool comprises a vertical long handle, an operating cross bar and an operating tool. A fixture is disposed at one end of the operating cross bar, and an operating tiller is disposed at the other end of the operating cross bar. The operating cross bar is fixedly disposed on the vertical long handle by screw locking after the vertical long handle is clamped by the fixture. The operating tool is installed at the bottom of the vertical long handle through a mounting port. The pneumatic fixture, a pneumatic wrench and hydraulic shears are installed on the vertical long handle to form a long-handle pneumatic fixture, a long-handle pneumatic wrench and long-handle hydraulic shears in a detachable manner, the monitoring device is connected with the display device, and accordingly workers can monitor inner conditions of the deep-well environment through video pictures on the display device, so that the maintenance unit is replaceable and diverse.