The invention relates to a method for extracting lead sulfide from brittle sulfur lead-antimony concentrate, and belongs to the technical field of nonferrous metal metallurgy. The method is characterized in that the brittle sulfur lead-antimony concentrate is processed by the aid of a secondary vacuum distillation process. The method includes briquetting the brittle sulfur lead-antimony concentrate and then placing the brittle sulfur lead-antimony concentrate in a crucible of a vacuum furnace, heating the brittle sulfur lead-antimony concentrate under the negative-pressure condition of 10Pa-50Pa at the heating rate of 13-16 DEG C/min under the control until the temperature of the brittle sulfur lead-antimony concentrate reaches 1250 DEG C, and preserving heat of the brittle sulfur lead-antimony concentrate for 60min; heating volatile matters under the negative-pressure condition of 10Pa at the heating rate of 5-10 DEG C/min until the temperatures of the volatile matters reach 750 DEG C, and distilling the volatile matters for 40min, wherein the volatile matters are obtained by means of primary vacuum distillation. The volatile matters are processed by means of secondary vacuum distillation to obtain lead sulfur residues with higher than 86.0wt% of lead and high-antimony and low-lead volatile matters with lower than 4wt% of lead. The method has the advantages that the brittle sulfur lead-antimony concentrate is mainly processed by the aid of environment-friendly and economical vacuum metallurgy processes, accordingly, the lead and antimony can be ultimately separated from each other, the lead sulfur can be ultimately obtained, and an economic benefit can be increased.