Tremella polysaccharide as well as preparation method and application thereof in improving intestinal environment

The invention belongs to the technical field of polysaccharide, and particularly relates to a preparation method of tremella polysaccharide, which comprises the following steps: (1) crushing dried tremella sporocarp, and sieving with a 50-70-mesh sieve to obtain dry tremella powder; (2) uniformly stirring the tremella fuciformis dry powder and distilled water according to a solid-liquid ratio of 1: (55-65) g/ml, and heating and boiling for 2-3 hours to obtain a polysaccharide crude extract; (3) after the polysaccharide crude extract is cooled to room temperature, centrifuging at the rotating speed of 5000-7000 r/min for 5-10 minutes, taking supernate, and carrying out rotary evaporation until the volume of the supernate is 1/8-1/10 of that of the original supernate, so as to obtain a concentrated solution; and (4) adding 85-95% ethanol solution with the volume being 4-6 times that of the concentrated solution into the concentrated solution, stirring for 5-10 minutes, standing for 12-14 hours at 4-6 DEG C, pre