The invention discloses an alkaline pectinase secretion-enhanced strain and an application thereof, and belongs to the technical field of genetic engineering. Through a gene recombination technology, UPR related genes of pichia pastoris are cloned and linked to a pichia pastoris expression vector pPGAZA and are converted to a Pichia pastoris GS115-pPIC9K-PGL strain, so that a plurality of strains, namely GS115-PGL / pGAPZA-HAC1, GS115-PGL / pGAPZA-ERO1, GS115-PGL / pGAPZA-UBC1 and the like, which are stronger in secretion and expression of alkaline pectinase than an original strain, are obtained, the enzyme activities of the strains, before the application of the method, are improved by 24.1%, 35.5% and 22.3%, and with the significant improvement, a good foundation is laid for the large-scale production of the alkaline pectinase. The alkaline pectinase disclosed by the invention can catalyze the pyrolysis of an alpha-1,4 glucosidic bond of polygalacturonic acid by virtue of a trans-elimination effect under an alkaline condition;and the alkaline pectinase can be widely applied to such industries as food, textile, paper-making and the like.