Abstract: The high voltage electrically insulative safety coupler for moling or earth augering equipment prevents high voltage electric shock to the equipment operator. The coupler is composed of first and second coupler elements, with the second coupler element including a shaft surrounded by an elastomeric retention member formed of a dielectric material such as polyurethane capable of withstanding high voltages of on the order of 50 kilovolts without breaking down. The retention member is compressed within a cavity in the first coupler element and frictionally engages the interior walls of the cavity. A hard dielectric guide bearing member fixed in position at the bottom of the cavity partially surrounds the second coupler element and prevents lateral movement of the shaft at the cavity bottom, and a second hard dielectric collar closely surrounds the shaft at the top of the cavity and fits at least partially within the cavity to prevent lateral movement of the shaft at the cavity top.