The invention belongs to the technical field of biology, and particularly relates to isoptericola halotolerans WX capable of highly producing alginate lyase and an application method for the isoptericola halotolerans WX. The isoptericola halotolerans WX capable of highly producing the alginate lyase is obtained through screening for the first time; and the strain WX is identified as the isoptericola halotolerans according to morphological characteristics and physiological-biochemical characteristics. The strain was collected in China General Microbiological Culture Collection Center on October 12th, 2011, and the collection number of the strain is CGMCC No.5336. The strain can produce the alginate lyase to degrade sodium alginate so as to produce alginate oligosaccharide, and the enzymatic activity can reach 432U/ml. The alginate lyase produced by the strain can efficiently degrade algin so as to produce the alginate oligosaccharide which has multiple bioactivities.