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This application relates to the technical field of floor slab casting, and in particular to a method for layered and multi-stage casting of recycled block-aggregate concrete floor slabs, comprising the following steps: S1: Erecting supports and prefabricated assembled frame modules, wherein the frame modules are integrally formed with floor slab reinforcement mesh, including bottom and top reinforcement mesh; S2: Pouring the first layer of recycled aggregate concrete and vibrating it to evenly cover the entire frame module with the first layer of recycled aggregate concrete; S3: Placing the recycled blocks; S4: Pouring the second layer of recycled aggregate concrete, which should be completed before the initial setting of the first layer of recycled aggregate concrete; S5: Concrete curing. This application has the effect of improving the quality and efficiency of floor slab casting.