The invention discloses a high-pressure tuner-type disconnection switch comprising a disconnection switch body, a long permanent magnetic actuator and an electronic controller. One end of a motion rod of the long permanent magnetic actuator is movably connected with a cutter body on the disconnection switch body; a distance from the connection position to the free end of the cutter body is 0.568-0.668 times of the cutter body length; the electronic controller controls the motion rod of the long permanent magnetic actuator to make linear motion; and the motion rod of the long permanent magnetic actuator is slantways crossed with the cutter body in a closing state to form an acute cross angle. The invention improves the operation efficiency and the safety reliability of the disconnection switch, overcomes the defects of time and labor waste, low labor efficiency and single switch function of a traditional manually operated disconnection switch and is suitable for a high-pressure power distribution system.