A two-color linear column infrared focal plane detector readout circuit structure, including a band-one input stage, a band-two input stage, a shift register and an external lead key pressure point working together with the two input stages, and its characteristic is that it consists of two A series of switching tubes, photosensitive elements, gate control tubes, integral capacitors, reset switches and source limit followers are connected to form, and the photosensitive element array and each input end of the readout circuit are electrically connected through the interconnection of indium columns. The circuit structure of the present invention is compact, the working points of the photosensitive element array of the two bands, and the corresponding integral capacitors can be set independently, and the response signals of the two bands are output respectively, and the readout circuit made with this structure has a modular form, which can Realize the seamless splicing of multiple modules to form a two-color long-line infrared focal plane detector.