AbstractProcessable microporous organic polymers (MOPs) attract incomparable research interest because their vairous types, such as monoliths and membranes are for practical application. Most processable MOPs usually need harsh conditions such as the use of expensive metal catalysts, specialized stereospecific monomers, etc., which restrict the sustainable and real applications of processable MOPs. Therefore, the economical mass production of processable MOPs remains a formidable challenge. Herein, a novel strategy is reported for constructing processable hypercrosslinked polymers (HCPs) need two steps synthesis of pre‐crosslinking and deep‐crosslinking using divinylbenzene (DVB) as a self‐crosslinking monomer under the catalysis of a small amount of FeCl3. The resulting HCPs monoliths possess high BET surface area of 1033–1056 m2 g−1 with hierarchical porosity, and show excellent mechanical strength up to 65 MPa. It is, to the best of authors' knowledge, the first report of using aromatic vinyl monomers as self‐crosslinking monomers to generate HCPs monoliths with high surface area, yielding no by‐products, and high mechanical strength.