Pre-amplification circuit of photoelectric detector

The utility model relates to a preamplifier circuit of a photoelectric detector, comprising an input module comprising a signal amplitude limiting unit and a photoelectric signal unit, the photoelectric signal unit is used for generating a corresponding input signal according to illumination intensity, and the signal amplitude limiting unit is used for carrying out amplitude limiting on the input signal; the amplification module is used for amplifying the input signal and then outputting the amplified input signal; the output module is connected with the output end of the amplification module and is used for isolating and reversely outputting signals; the signal amplitude limiting unit is arranged in the input module, when the photoelectric signal unit receives external strong light irradiation, if a signal with a large amplitude is generated, the signal amplitude can be limited through the signal limiting unit, and the situation that the large signal directly enters the amplification module, and consequently