The invention relates to the field of building materials, and particularly discloses to bubble-mixed lightweight soil slurry and a preparation method thereof. The bubble-mixed lightweight soil slurryis prepared from the following components: 225 kg/m<3> ordinary Portland cement, 25 kg/m<3> slag, 25 kg/m<3> lime, 600 kg/m<3> aeolian sand, 210 kg/m<3> water, and 500 L/m<3> bubbles. According to thebubble-mixed lightweight soil slurry, the mix proportion design step is simple and clear, and the method is specific and easy to grasp; the content of the cement is replaced by admixture, the bubblesand other components, at the same time the needs of special projects are met, and resources are saved while the engineering standard is met; due to the fact that incorporation of the bubbles decreases density of materials, damage caused by uneven settlement of a foundation can be effectively reduced when the materials are used for roadbed construction; and due to internal uniform porosity of thematerials, ettringite crystals corroded in the sulfate environment can be buffered through pores, so that the slurry has good resistance to sulfate corrosion.