The invention relates to a manufacturing method of a glass fiber reinforced gypsum ice grating plate, comprising the following steps of: prepared slurry mixing, moulding in a mould, demoulding, dehydrating and drying, wherein the step of moulding in a mould comprises the steps of: placing a model on a vibrating worktable, coating a layer of demoulding agent in a cavity of the model, pouring a certain amount of prepared slurry in the cavity of the model, heightening a numerical control nozzle or a manual tool to a certain height of a mould, sequentially weaving glass fiber twist-less thick yarn in the reversed space of the mould according to a direction given by the preset program, pouring a layer of the certain amount of prepared slurry after accomplishing one-layer laying, vibrating the worktable during pouring, repeating the program for many times, and improving the height of the control nozzle or the manual tool once after finishing the program every time. The manufacturing method of glass fiber reinforced gypsum ice grating plate, provided in the invention, fills a blank, finishes the history that the ice grating plate can not be made of glass fiber reinforced gypsum, and obtains obvious progress and economic benefit.