The present disclosure relates to a process of preparing polyphosphazene, preferably a process of preparing polyphosphazene in presence of a catalyst selected from the group consisting of hydroxy ammonium halide, trifluoroacetic acid, and a catalyst system or mixtures thereof to obtain polyphosphazene, The present disclosure also relates to a catalyst system comprising, CaSO4.2H2O/X. The catalyst system of the present disclosure is used for the preparation of polyphosphazene.
