The invention relates to a method for preparing a flyash excitant based on palm leaves, belongs to the technical field of flyash excitants and provides a method for preparing a flyash excitant based on palm leaves. The method comprises the steps of extracting organic acid substances and an organic salt from the palm leaves by using ultrasonic oscillation and gas explosion; adding sodium hydroxide and the organic acid substances for reaction to increase the content of the organic salt; modifying an extract by adopting vanadium pentoxide as a catalyst and using dimercaprol dimercaptopropanol to increase the bonding capacity of the extract and a metal; and finally adopting the activated and modified carbide as a carrier for adsorbing beneficial components in the modified extract to prepare the flyash excitant. According to the prepared flyash excitant, the potential activity of flyash can be effectively excited, the dose of the flyash in concrete is increased, the peaceability of the concrete can be improved, cement is greatly saved under the condition of not affecting the strength of the concrete, the cost of the concrete and a concrete product is reduced, and the method has significant economical benefits and social benefits.