The invention discloses a glass and a preparation method thereof. The preparation method comprises the following steps: mixing yellow sands, limestone, feldspar, soda ash, barium oxide, boric acid, acoloring agent, a clarifying agent and a decolorizing agent according to a certain weight ratio, adding the obtained mixture into a furnace, forging the mixture, carrying out secondary clarification,bubble removal and cooling molding, and finally annealing the molded mixture to obtain the finished product. The cheap and resource-rich yellow sands are used to substitute quartz sands as a raw material for the production of the glass, so the production cost of the glass is reduced.