The invention discloses an infrared focal planar array and a readout circuit of the infrared focal planar array; the readout circuit comprises an output pad and an array control signal generation logic and also comprises N+1 first-stage output buffers, M+1 second-stage output buffers and P+1 third-stage output buffers, wherein the first-stage output buffers are uniformly divided into M+1 groups; each group of the first-stage output buffers are respectively connected with the same second-stage output buffer by a first-stage switch; the second-stage output buffers are uniformly divided into P+1groups; each group of the second-stage output buffers are respectively connected with the same third-stage output buffer by a second-stage switch; the third-stage output buffers are respectively connected with the output pad by a third-stage switch; a first-stage control signal, a second-stage control signal and a third-stage control signal are generated by the array control signal generation logic; and M, N and P are natural numbers. In the infrared focal planar array and the readout circuit, the analog voltage can be output outside a chip at a high speed precisely, and the energy consumption is lower.