Ground-contact feedback type undercarriage system of unmanned helicopter

The invention discloses a ground-contact feedback type undercarriage system of an unmanned helicopter. The system comprises a conventional skid-type undercarriage, an undercarriage body joint, a signal transmitter, a flight control computer and a steering engine; the conventional skid-type undercarriage is connected with the unmanned helicopter through four undercarriage fuselage joints; the four undercarriage fuselage joints are respectively a right front undercarriage fuselage joint, a left front undercarriage fuselage joint, a left rear undercarriage fuselage joint and a right rear undercarriage fuselage joint; and each undercarriage fuselage joint comprises a pressure sensor, and the load loaded on the undercarriage fuselage joint can be measured through the pressure sensor by means of load calibration. The system can sense the contact state of the unmanned helicopter and the ground/ship surface and inform a flight control computer or a manipulator of the contact state, and the flight control computer or