The invention belongs to the technical field of organosilicon production, and concretely relates to a high-efficiency recovery method for a high boiling product in organosilicon slag slurry. The method comprises the following steps: a high temperature slag slurry in an organosilicon monomer synthesis washing tower reboiler is extracted to an organosilicon slag slurry processing apparatus through apump and an insulating pipe and distill the high boiling product; a magnetic plate is arranged at a feed port of the organosilicon slag slurry processing apparatus, and iron powder in the organosilicon slag slurry is absorbed; before the organosilicon slag slurry is processed by an organosilicon processing device, an inert gas is introduced into the organosilicon slag slurry processing apparatus;and the high boiling product obtained by condensation in the organosilicon slag slurry processing apparatus is conveyed by a water pipe to a high boiling product cracking device for cracking. The high-efficiency recovery method realizes real-time treatment of the organosilicon slag slurry, and has the advantages of high automation degree, and high recovery rate of a silane monomer.