The invention provides a yoghurt pudding stabilizer, a yoghurt pudding and a preparation method of yoghurt pudding. The yoghurt pudding stabilizer is prepared from the following components in percentage by weight: 20-40 percent of sodium carboxymethylcellulose, 10-30 percent of carrageenan, 10-30 percent of konjak gum, 10-20 percent of potassium citrate, 5-15 percent of sodium citrate, 5-10 percent of modified starch and 5-10 percent of maltodextrin. The yoghurt pudding is prepared by virtue of the yoghurt pudding stabilizer. The invention also provides the yoghurt pudding stabilizer and the preparation method of the yoghurt pudding. By adopting the yoghurt pudding stabilizer, the bad phenomena of the yoghurt pudding that proteins flocculate, gelation can not be finished or the like can be effectively prevented, and uniform state, integral gel shape and moderate elasticity of a product are ensured.