The invention relates to a pig-whole-genome low-density SNP chip. The chip is a DNA sequence which is shown in an SEQ ID NO.1-8846. The pig-whole-genome low-density SNP chip has the advantages that the pig-whole-genome low-density SNP chip is researched and analyzed from an existing 80 k chip, and under the situation that the selection accuracy is not remarkably lowered, unrelated SNP marks are creatively removed, and the number of the SNP marks is lowered to 8846. The pig-whole-genome low-density SNP chip has the innovative significance on pig breeding and selection, so that pig breeding is possibly popularized through the pig-whole-genome low-density SNP chip, and the Chinese pig breeding and selection progress can be greatly accelerated.