The invention discloses a device for separation and overflow of coarse coal slime and slime removal and classification of clean coal slime through a liquid-solid fluidized bed. The device comprises a separation and classification barrel body, a fluid distributor and an overflow and slime removal device, wherein the separation and classification barrel body consists of an upper barrel body, a lower barrel body and a bottom cone; an upper opening of the bottom cone is connected to the lower part of the lower barrel body, and a tailings valve is arranged at the lower opening of the bottom cone; the fluid distributor is arranged between the lower barrel body and the bottom cone; the overflow and slime removal device consists of an oblique barrel body, a splitter plate and an overflow groove; the cross sectional area of an upper opening of the oblique barrel body is greater than that of a lower opening of the oblique barrel body; the splitter plate is arranged at the upper part of the oblique barrel body in an oblique manner; the overflow groove is formed in the periphery of the top of the oblique barrel body, and is divided into a left part and a right part by the splitter plate; a coarse-grain substance overflow pipe communicates with the right half part of the overflow groove, and a fine-grain substance overflow pipe communicates with the left half part of the overflow groove; after subsiding in the oblique barrel body, coarse clean coal is discharged through a coarse clean coal blow-off valve at the tail of a top cone, and fine slime is directly discharged from the overflow groove, so that the removing capacity of the overflow groove to the fine slime is strengthened, and the quality of overflow products is improved.