The present invention provides a multi-gene detection primer probe set for early diagnosis, screening or detection of digestive tract tumors, and belongs to the field of biomedicine. The primer probeset comprises at least two groups selected from the following five groups of primers and probes: (1) a forward primer, a reverse primer, a Blocker primer and a probe of a methylated SDC2 gene; (2) a forward primer, a reverse primer, a Blocker primer and a probe of a methylated SFRRP2 gene; (3) a forward primer, a reverse primer, a Blocker primer and a probe of a methylated SEP9 gene; (4) a forwardprimer, a reverse primer, a Blocker primer and a probe of a methylated CADM1 gene; and (5) a forward primer, a reverse primer, a Blocker primer and a probe of a methylated PAX1 gene. The multi-gene detection primer probe set simultaneously detects two or more methylated markers, is high in sensitivity, good in specificity, convenient in detection, and low in cost, and can be used for early screening and auxiliary diagnosis of the digestive tract tumors.