An extrusion type automatic high-viscosity insulating varnish spraying teleoperator for an overhead power transmission line is characterized by comprising a movable trolley body and further comprising an onboard control system (18), a power module (8), a motor driver (7), a compressing device (19), a spraying motor (16), an insulating varnish barrel (12), a transmission gear system (14), lead screws (3) and a spraying head (2), wherein a driving wheel (3) and a driven rolling wheel (4) are arranged on the movable trolley body. The teleoperator can automatically walk on the overhead power transmission line. A ground control system can regulate the revolving speed of the spraying motor at the lower portion of the movable cart body of the teleoperator and the revolving speed of the transmission gear system and the lead screws, and control the walking speed and insulating varnish spraying amount of the teleoperator, and therefore, automatic spraying of insulating varnish with specific thickness can be achieved.