The invention discloses a transmission circuit of digital output signals in an infrared focal plane array reading circuit. The transmission circuit of the digital output signals in the infrared focal plane array reading circuit comprises a digital output signal collecting circuit and a current comparator circuit. The digital output signal collecting circuit comprises n digital output signal collecting units, and each digital output signal collecting unit converts collected digital signals into analog signals and outputs the analog signals. The current comparator circuit is used for converting the analog signals input by the digital output signal collecting units into the digital signals and outputting the digital signals. According to the transmission circuit of the digital output signals in the infrared focal plane array reading circuit, the digital output signal collecting units convert the collected digital signals into the analog signals and transmit the analog signals, the analog signals are current signals, relative to voltage signals, disturbing influence on the current signals from the external in the process of transmitting is small, after transmission is finished, when output is needed, the current comparator circuit converts the analog signals into the digital signals, and therefore external disturbance on the signals in the process of transmitting can be reduced.