The invention discloses a manganese-cobalt-nickel-oxygen thermistor detector with a bent supporting leg micro-bridge structure and a method. The thermistor detector comprises a double parabolic sapphire substrate, a SiO2 bridge pier grown by a magnetron sputtering method, a manganese-cobalt-nickel-oxygen thin film material and an ohmic contact electrode of a bent leg structure. After the bent legand a sacrificial layer below the manganese-cobalt-nickel material are released, a self-supporting suspended structure is formed. According to the structure, the direct heat conduction between a photosensitive surface and the lower substrate is reduced, and the heat conduction between the electrode and the substrate is effectively reduced, so that a response ratio of the thermistor detector is greatly improved.