The invention discloses a polyimide resin diamond grinding wheel and a preparation method of the polyimide resin diamond grinding wheel. The polyimide resin diamond grinding wheel is prepared from the following components in parts by weight: 50-60 parts of diamond grinding material, 5-10 parts of white corundum grinding material, 5-10 parts of garnet sand, 5-15 parts of polyimide resin powder, 2-6 parts of furfuryl alcohol, 1-2 parts of trioctyl trimellitate, 5-10 parts of cryolite, 5-10 parts of gypsum powder, 2-5 parts of nano siliceous shale powder and 2-5 parts of copper powder. According to the polyimide resin diamond grinding wheel and the preparation method of the polyimide resin diamond grinding wheel, as polyimide resin serving as a binding agent has higher mechanical strength and excellent heat resistance, the durability of the prepared resin grinding wheel is improved greatly; as ceramic material is added into padding, the adhesive property is good, the grinding materials hardly fall off, the heat resistance and hardness of the resin grinding wheel are improved, and cracks formed by rigid grinding are reduced, thereby the use efficiency and service life of the resin grinding wheel are improved further; and in addition, since copper power is added, fast heat dissipation effect is achieved, a great deal of heat generated in a cutting process of the grinding wheel can be dissipated quickly, and the effect of lowering cutting temperature is achieved.