The present invention mainly relates to catalysts for preparing organosiloxanes and polyorganosiloxanes obtained by polycondensation methods. The catalyst of the present invention is the reaction product of phosphonitrile chloride with a compound of formula (I).;In the above formula,;R is independently the same or different unsaturated and / or saturated monovalent hydrocarbon radicals or hydrogen of 1 to 6 carbon atoms,;Only one hydrogen atom is bonded to each silicon atom,;m is a value from 0 to 1000.;The volatile chlorine-containing silicon compound produced during the reaction can be completely or partially removed as necessary.
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