The invention provides an abrasive and coating slurry of a lithium-ion power battery diaphragm and preparation methods thereof. The coating slurry comprises 10-25% of chemical binder, 1-3% of thickening agent, 25-55% of abrasive slurry, 0.1-0.3% of defoaming agent, 0.1-0.3% of wetting agent, 0.1-0.3% of dispersing agent and 0.1-0.3% of levelling agent by w/w. The abrasive, the coating slurry and the preparation methods have the beneficial effects that the costs of the abrasive slurry and the coating slurry can be greatly reduced by adopting cheap silicon carbide as a main raw material of the abrasive slurry or the coating slurry

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