The invention discloses contact net line fault intelligent cutting equipment and a system and a method. The contact net line fault intelligent cutting equipment comprises a high-voltage device and a control protective device. The high-voltage device is arranged on contact net branch lines and used for switching a circuit of the contact net branch lines and detecting a state of the circuit, the control protective device is connected with the high-voltage device and used for judging according to the circuit state which is obtained by detecting of the high-voltage device so as to obtain whether the circuit state is normal or not, and therefore, the high-voltage device is switched and controlled. The high-voltage device and the control protective device are arranged on the contact net branch lines, the aim that when the contact net lines is broken down, the contact net branch lines can be automatically cut from a main line is achieved, and the fault branch lines can be precisely confirmed. The contact net line fault intelligent cutting equipment is safe in performance and stable, can facilitate working staff rapid processing of line faults, and greatly improves efficiency of power supplying management working.