The invention relates to a method of preparing a halogenoalkyldialkylchlorosilane having formula (I): Hal-(R2R3)Si—(CH2)s-Hal by hydrogen silylation reaction of a reaction medium comprising a silane having formula (II): Hal-(R2R3)Si—H and an alkene halide having formula (III): CH═CH—(CH2)x-2Hal, in the presence a catalytically-effective amount of a hydrogen silylation catalyst based on a platinum group metal. The inventive method is characterised in that, at the end of the hydrogen silylation reaction, the product formed having formula (I) and the platinum group catalytic metal are recovered. According to the invention, the catalytic metal recovery method is performed under the following conditions: a) the catalytic metal is recovered (1) directly from the reaction medium at the end of the reaction or (2) from the liquid distillation residue comprising the by-products and the platinum group metal, residue obtained after distillation of the reaction medium in order to separate the product having formula (I); b) the catalytic metal is recovered by bringing the reaction medium or the distillation residue into contact with an effective amount of a solid substance that absorbs the platinum group metal; and c) the adsorbent and the platinum group metal are separated so that said metal can be recovered. The invention can be used for the synthesis of 3-chloropropyldimethylchlorosilane with the recovery of the iridium-based catalyst.