The invention provides a B-Al-ZSM-11 zeolite catalyst in the methanol to propylene reaction and a preparation method of the B-Al-ZSM-11 zeolite catalyst. In the invention, the method includes the following steps: a boron source, an aluminium source, a silicon source, an alkali source, an inorganic salt, a template and water are used as raw materials; the raw materials are subjected to crystallization, filtration, washing, drying and roasting; the ZSM-11 zeolite simultaneously containing boron, aluminium and silicon in the skeleton is synthesized by one step. The synthetic process is simple, the degree of crystallinity of the product is high, the content of skeleton boron and aluminium can be adjusted, and the acid strength of a molecular sieve can be effectively controlled; the B-Al-ZSM-11 zeolite synthesized by the method can be used for catalyzing the methanol to propylene reaction, and is higher in propylene selectivity and product P/E ratio (molar ratio of propylene to ethylene in the product) compared with B-Al-ZSM-5 or ZSM-11.