The invention discloses a multifunctional alkalinized soil conditioner. The multifunctional alkalinized soil conditioner comprises quinquangular particles consisting of nutrition inner cores and alkali-reducing and salt-resisting agent outer layers, wherein the nutrition inner cores and the alkali-reducing and salt-resisting agent outer layers form quinquangular shapes; the maximal diameter of each alkali-reducing and salt-resisting agent outer layer is 4 to 7mm; the maximal diameter of each nutrition inner core is 2 to 4mm. The multifunctional alkalinized soil conditioner can be applied to plants, has the advantages of convenience, low price, attractive appearance, environment friendliness and the like, and is suitable for regions with basification soil in China. The soil conditioner has the effects of improving and fertilizing soil, and the problem of low fertility of salinized soil is solved. Therefore, in the salinized regions, nutrient soil suitable for a garden or planting flowers by residents can also be convenient to obtain, and a living room is beautified.