The invention belongs to the technical field of edible fungi and particularly relates to a pure white hypsizigus marmoreus strain, and a molecular marker, a specific primer pair and an application thereof. The pure white hypsizigus marmoreus strain provided by the invention has a name of Finc-W-6, belongs to hypsizigus marmoreus, is collected in China General Microbiological Culture Collection Center (CGMCC) with an address of 3#, yard 1#, west beichen road, chaoyang district, Beijing, and has a collection number of CGMCC No.12523 and a collection date of June, 30th, 2016. According to the technical scheme provided by the pure white hypsizigus marmoreus strain, and the molecular marker, the specific primer pair and the application thereof, the obtained long-stem pure white hypsizigus marmoreus meets diversified demands of the market and is short in cultivation period, relatively concentrative in fruiting time, high in unit yield, beautiful in shape, long in refreshing time, very suitable for large-area planting promotion and wide in market prospect.