The invention discloses a fireproof foam board and a production method thereof. The fireproof foam board comprises a waterborne binding agent solution, polystyrene particles, magnesia, talcum powder, wood powder and a foaming agent in volume ratio of 0.3:1:0.2:0.05:0.1:0.0005, wherein the waterborne binding agent solution is prepared from water and a waterborne bonding agent according to the volume ratio of 1:450; weighing various materials according to the formula; feeding the wood powder in the waterborne binding agent solution firstly; uniformly stirring and pouring the magnesia and the talcum powder; uniformly stirring and feeding the foaming agent for foaming; after foaming, enabling the mixture and the polystyrene particles to simultaneously enter the interior of a special stirrer and uniformly stirring; after pouring the stirred mixture in a die and applying pressure of 400kilos, pushing the mixture in a greenhouse with 40DEG C and drying for one hour; and finally demoulding and cutting into boards with a certain specification by using a dicing saw. The fireproof foam board using polystyrene foam has the characteristics of excellent heat-insulating performance, reasonable formula, reached A-level fireproof property, environment protection, no pollution, and simple producing and mounting method.