The utility model discloses an aspheric surface shape swing arm type detection device. An existing swing arm type contourgraph is difficult to operate due to multi-degree-of-freedom adjustment. The device comprises a measuring device and a double-capacitance sensor measuring head. The double-capacitance sensor measuring head is fixed on the rotating table surface of the processing platform; the measuring device comprises a horizontal driving mechanism, a swing arm rotating platform, a measuring arm, a measuring head vertical adjusting device and a measuring head module. The measuring arm is composed of a rotary swing arm and a movable swing arm. The measuring head vertical adjusting device comprises an X-axis-around adjusting device and a Y-axis-around adjusting device. According to the utility model, the measuring device and the double-capacitance sensor measuring head are combined for use, so that the technical difficulty of operation is reduced while the detection precision is ensured, the efficiency of the aspheric contact type measuring head in the adjusting process is improved, and the cost of the aspheric manufacturing process is reduced.