The invention discloses a 10kV distribution network line live obstacle clearing mechanical arm, which comprises a mechanical body, a control system and a power supply system, and is characterized in that the mechanical body is a six-axis six-degree-of-freedom joint serial mechanical arm and comprises a base, a five sections of an arm body, six joints and an end executor, the base is a rotating platform which is fixedly installed on a manned work bucket of a high-voltage live working vehicle, the arm body is a hollow cavity body and driven by a DC motor is a servo manner, the base and the five sections of the arm body are connected in series through the six joints, the end executor of the mechanical arm is a DC electric chain saw and connected with an output end of the sixth joint through a clamping slot, and the executor is provided with an independent joint; the control system comprises a main controller, a remote control receiver, an industrial remote controller, a servo unit and a monitoring unit, wherein the servo unit adopts a driver and a DC motor, and the monitoring unit comprises a vibration sensor and a power frequency field intensity meter; and the power supply system is a DC system formed by a storage battery. The 10kV distribution network line live obstacle clearing mechanical arm can replace manual work to perform tree obstacle clearing in server environments and live conditions.