The invention discloses a waterproof decoration plate and a production method thereof. The production method is simple and easy, and the waterproof decoration plate obtained in the invention has the characteristics of high strength, superior impervious and waterproof performances, strong base change resistance and bright appearance. The waterproof decoration plate comprises fast setting sulfoaluminate cement, water, wood powder, fly ash, crack resisting fibers and a waterproof modifier, wherein the waterproof modifier comprises Portland cement, sodium carbonate, a 3-5% calcium chloride solution, citric acid, a pH adjusting agent, silica sand and aluminum chloride. The production method comprises the following steps: 1, proportioning: adding and stirring above raw materials according to above proportions to obtain a slurry; 2, paving: brushing a die with an isolation agent, and paving the stirred slurry; 3, carrying out surface finishing, and carrying out primary curing; 4, cutting the obtained material according to required specifications; 5, sanding the cut material; and 6, coating the obtained plate with a waterproof coating layer, and carrying out secondary curing.