Refiner of aluminium and aluminium alloy with high efficiency and low cost, and preparation method thereof

The invention provides a refiner of aluminium and aluminium alloy with high efficiency and low cost and a preparation method thereof, belonging to the technical field of a refiner of aluminium and aluminium alloy and solving the problems that in the prior art, the refiner of the aluminium and aluminium alloy has higher requirements for technique equipment, trivial and complex technique, excessive cost, poor product performance and the like. The refiner of aluminium and aluminium alloy with high efficiency and low cost is aluminium-titanium-carbon-rare earth master alloy; the master alloy contains 3% to 10wt% of Ti, 0.02 to 1wt% of C, 0.02 to 1wt% of RE, aluminium and impurity elements; and the preparation method comprises the following steps of: adopting the rare earth compound as a reacting promoter, casting after smelting reaction and obtaining the refiner. The preparation method has low cost, high efficiency and easy industrialization; the raw material has low price and wide source; the preparation can be carried out in a well-type resistance furnace, does not need extra stirring equipment, and has simple technique; and the refiner has the advantages of capability of being used with a modifier simultaneously, stable organization, refining effect and the like.