Considering the nuclear fuel reprocessing conditions at 75 °C and the oxidizability of iodine, thermal and chemical stabilities are especially important for porous materials to enrich iodine. However, most organic or metal coordinated porous materials hardly meet this long‐term demand. Here, highly porous carbon is prepared from pyrolysis at high temperature using triptycene‐based hypercrosslinked polymer as precursor, and possesses high Brunauer–Emmett–Teller (BET) surface area of 3125 m2 g−1 and pore volume of 1.60 cm3 g−1, and exhibits excellent iodine uptake ability of 340 wt% at 75 °C. Moreover, the obtained hyperporous carbon also displays remarkable capture efficiency of iodine from water with the maximum adsorption capacity of 926 mg g−1. With the characteristics of easy preparation and good chemical and thermal stabilities, the hyperporous carbon may be an ideal adsorbent in iodine capture. Hyperporous carbon from triptycene‐based hypercrosslinked porous polymer exhibits excellent iodine capture and gas storage.