High-temperature-resistant casting system and preparation method thereof

A high-temperature-resistant casting system, comprising following casting elements in a connection relationship:

• a sprue cup and a down sprue connected with a lower end of the sprue cup, wherein the other end of the down sprue is connected with one end of a filtering element, the other end of the filtering element is connected with a three-way pipe, openings in two sides of the three-way pipe are connected with one end of an inlet section of a runner, and one end of an outlet section of the runner is connected with a tapered elbow;
• and the casting elements comprise the following components in percentage by weight:
• 41-51% of a refractory fiber, 40-51% of a silicate fiber and 5-19% of a binder, wherein the refractory fiber is obtained by mixing a paper fiber, a carbon fiber and asbestos in a mass ratio of (1-15):(20-35):(10-15), and wherein the binder is a mixture of sodium silicate, mullite, graphite and brown fused alumina.