The embodiment of the invention discloses a band-gap reference circuit for an infrared focal plane array. The band-gap reference circuit comprises an operational amplifier circuit 10, a common-drain amplifier circuit 20 and a zero-temperature-excursion voltage generation circuit 30, wherein the zero-temperature-excursion voltage generation circuit 30 is used for generating positive temperature coefficient current and generating reference band-gap zero-temperature-excursion voltage by means of a positive temperature coefficient circuit, and the common-drain amplifier circuit 20 is connected to the zero-temperature-excursion voltage generation circuit 30 and the operational amplifier circuit 10 and used for providing a feedback loop from output to input for the operational amplifier circuit 10. According to the band-gap reference circuit, the zero-temperature-excursion voltage generation circuit comprises two subcircuits generating positive temperature coefficient current, positive temperature coefficient voltage is increased, the resistance value of R-trim can be reduced, and the area of a chip can be reduced; furthermore, a current mirror structure does not exist in the circuit, PTAT current does not need to be generated, superposition of positive temperature voltage and negative temperature voltage is achieved directly on the subcircuit generating positive temperature coefficient current, circuit consumption is reduced greatly, and low power consumption is achieved.