This invention relates to a trailing integrated micro-lens infrared focal plane detector and a preparation method for micro-lenses, in which, said detector includes: infrared photosensitive meta-array chips, a read-out circuit, a blending mutual-connected indium post and a micro-lens array, which is processed by micro-mechanism at the back of the substrate of the array chip applying an etching method to the positive pattern of a memory focal plane detection chip and a plasma combined etching technology, and the optical shafts of the trailing integrated micro-lens are coincident with the photosensitive face central normal of the corresponding photosensitive pixels. |