The invention discloses a method for preparing YAG transparent ceramics based on an improved Isobam gel system. The method comprises the following steps that (1) grinding balls, an organic solvent, adispersing agent A, a sintering additive and ceramic powder are placed into a ball mill tank, ball milling and mixing are carried out to obtain mixed slurry A; (2) the mixed slurry A is dried, sievedand calcined to obtain raw material powder conducted with gel injection molding; (3) deionized water, an Isobam solution, an epoxy resin cross-linking agent, a pH conditioning agent, a dispersing agent B and the grinding balls are added into the ball mill tank, lastly, the raw material powder is added, after preliminary stirring is carried out, and then ball milling and mixing are carried out to obtain mixed slurry B with high solid content; (4) vacuum degassing, injection molding, gel drying and curing and gel discharging are carried out; (5) vacuum sintering, annealing and polishing are carried out on biscuit after gel discharging, and the YAG transparent ceramics are obtained. The provided method for preparing the YAG transparent ceramics based on the improved Isobam gel system has theadvantages that the solid content of the ceramic slurry is improved, the density of the biscuit is improved, the permeability of the YAG transparent ceramics prepared by vacuum sintering is greatly improved, the technology is simple, and the method is conductive to industrialized production.