The invention discloses a quartz powder repair coating, which comprises the following components in part by weight: 70 to 80 parts of quartz powder, 10 to 20 parts of bentonite, 5 to 10 parts of sodium carboxymethylcellulose mixture, 5 to 10 parts of polyvinyl alcohol, 2 to 8 parts of reinforcing granules and the balance of water, wherein the reinforcing granules comprise the following componentsin part by weight: 50 to 60 parts of stainless steel fiber, 40 to 50 parts of ferric oxide powder and 10 to 20 parts of graphite powder; and the sodium carboxymethylcellulose mixture is pasty solution and comprises the following components in part by weight: 20 to 30 parts of sodium carboxymethylcellulose and 100 parts of water. The quartz powder repair coating has the advantages of simple components, simple preparation operation, low production cost, high strength, high toughness and easy uniform mixing.