The application of covalent organic polymer for CO2 capture has gained interest due to its high CO2 adsorption capacity and high hydrothermal stability. Commonly synthesized via either polycondensationreaction or coupling reaction, with conventional heating, the synthesis of these covalent organic polymers adsorbent are very lengthy, i.e. 12 to 24 hours. This paper reports the synthesis of covalent organic polymer adsorbent via microwave heating resulting in up to 75 shorter synthesis time as compared to conventional technique. The synthesized adsorbent, COP-4A and COP-4B,hasBET surface area of 1397 m2/g and 1461 m2/g, respectively, with CO2 uptake of up to 49.3 mg/g and 69.4 mg/g, respectively, at 1 atm and 298K operating condition. Thus, the covalent organic polymer adsorbent prepared via the microwave assisted technique has similar performance in comparison to previously reported work, with the advantage of shorter synthesis time. © 2016 The Authors.