The invention discloses a concrete with high extension strength and a preparation method thereof. The concrete with high extension strength includes an aggregate and mortar, and chemical bonding adhesive for improving the bonding strength of an interface between the aggregate and the mortar is attached to the surface of the aggregate. According to the preparation method of the concrete with high extension strength, firstly, the aggregate and the mortar are mixed, the mixture is mixed with a prepared cement mortar mixture to form concrete pulp with high extension strength, the concrete pulp ismade into concrete structural parts with high extension strength after being poured and solidified, and through the chemical bonding adhesive, the bonding interface capable of improving the bonding strength of the aggregate and the mortar is formed between the aggregate and the mortar. The concrete prepared through the preparation method has higher extension strength, and thus the technical purpose of improving the extension strength of the concrete can be conveniently achieved.