The fabrication method and the pyroelectric response of a single element infrared sensor based lead zirconate titanate (PZT) particles and polyvinylidene fluoride P(VDF-TrFE) copolymer composite thick film is reported in this paper. A special thermal insulation structure, including polyimide (PI) thermal insulation layer and thermal insulation tanks, was used in this device. The thermal insulation tanks were fabricated by laser micro-etching technique. Voltage responsivity (R V ), noise voltage (V noise ), noise equivalent power (NEP), and detectivity (D * ) of the PZT/P(VDF-TrFE) based infrared sensor are 1.2×10 3 V/W, 1.25×10 − 6 VHz 1/2 , 1.1×10 −9 W and 1.9×10 8 cmHz 1/2 W −1 at 137.3Hz modulation frequency, respectively. The thermal time constant of the infrared sensor τ T was about 15ms. The results demonstrate that the composite infrared sensor show a high detectivity at high chopper frequency, which is an essential advantage in infrared detectors and some other devices.