The invention discloses a normal-incidence immersed non-refrigeration film type infrared detector. A germanium single crystal hemisphere lens is arranged on the surface of sensitive element film of the infrared detector and can carry out convergence on infrared signals, and the sensitive element film of the infrared detector is arranged on the condensation center focus of the germanium single crystal hemisphere lens. According to the structure of devices of the normal-incidence immersed non-refrigeration film type infrared detector, the manufacturing technology is simple, only one time of graph photoetching, two times of slicing and two times of mask gold plating need to be carried out, electrodes of the film type infrared detector can be led from the film surface to the reverse side of a substrate, normal-incidence immersed detection of the infrared sensitive element film is achieved, the phenomenon that light loss is caused due to the fact that infrared radiation signals are reflected and absorbed by the substrate under the condition of reverse incidence is avoided, the responsivity and the detectivity of the film type infrared detector are greatly improved, and the response time of the devices is shortened; according to the designed device structure, wire leading and packaging are facilitated, and the devices can be applied to mass production of the normal-incidence immersed non-refrigeration film type infrared detector.