The invention discloses an insulation coating for the surface of a low-voltage electric appliance and a preparation method thereof, and relates to the technical field of the insulation coating. The insulation coating is prepared from the following raw materials in parts by weight: 20-30 parts of rubber powder, 15-25 parts of epoxy resin, 10-15 parts of organic silicon resin, 6-15 parts of nanosilicon dioxide, 3-8 parts of nano-zinc oxide, 3-8 parts of nano-magnesium oxide, 3-8 parts of nano-aluminium oxide, 8-16 parts of glass fiber, 6-15 parts of attapulgite, 3-8 parts of calcium stearate, 1.2-2.5 parts of dispersant, 0.8-1.5 parts of defoamer, 2-5 parts of anti-aging agent, 1.5-3.2 parts of adhesive force accelerant and 3.6-6.2 parts of curing agent. The insulation coating has the advantages of high insulation performance, high binding force, easiness in even coating, good anti-aging performance, small possibility of oxidative cracking, long service life, high practicality, simple and easily-learnt preparation process, high operability and easiness in mass production and popularization.