Direct (hetero)arylation polymerizations(DHAP) have attracted great attention in recent years to synthesize various conjugated polymers such as polythiophenes and polycarbazoles. This polymerization methods are atom-, step-economical because these can reduce the undesired organometallic byproducts and the number of synthetic steps. However, conventional DHAPs are limited to C-C bond formation, and polymerization method for C-N bond formation using C-H activation has remained unexplored to date. Here, we report a Iridium-catalyzed Direct C-H amidation polymerization(DCAP) that enables the synthesis of high-molecular-weight, defect-free polysulfonylamides. We discovered that a reactive directing group, additives, silver salts, and reaction temperature are key factors for efficient DCAP through model study and optimization. This polymerization allowed high-molecular-weight polysulfonylamides with various readily accessible bis-sulfonyl azides. Furthermore, these polymers emit fluorescence with high quantum yields and large stokes shifts due to excited-state intramolecular proton transfer(ESIPT) while these polymers have different structures from conventional fluorescent conjugated polymers. Notably, this research demonstrates a successful atom-, step-economical DCAP showing defect-free, high-molecular-weight fluorescent polysulfonylamides.