The invention discloses a corn straw fiber enhanced fly ash polymer gel material and a preparation method thereof. In the preparation method, the corn straws are mixed into an alkali-excited fly ash polymer gel material, and then the mixture is subjected to certain maintenance conditions so as to enable the material system to have good properties. The corn straw, namely a waste which has not been effectively utilized, is used to enhance a poly gel material prepared from an industrial waste fly ash. A novel way is provided for waste utilization, the environment burden is relieved, the energy consumption is reduced, and the material performances are strengthened. The corn straw fiber enhanced fly ash polymer gel material is an unfired and clinker-free material, is a zero-carbon-emission environment-friendly engineering material, is according with the social development trend, and has a good social benefit and economic benefit.