The invention provides a process for applying dry aluminum hydroxide fine materials, comprising the following steps: an aluminum hydroxide finished product is obtained from sodium aluminate seminal fluid through crystal seed decomposition, separation and washing; the aluminum hydroxide finished product is dried and then screened so as to form a coarse material part and a fine material part; the coarse material part is used as raw material to be sent into an aluminum fluoride production system; and the fine material part which is dried and screened is used as a crystal seed for a crystal seed decomposition procedure of the sodium aluminate seminal fluid. As the process directly uses the fine material part after screening the aluminum hydroxide for the crystal seed decomposition procedure of the sodium aluminate seminal fluid, the fine material part of which the price per ton is about 300 yuan lower than the aluminum hydroxide finished product can be directly transformed into the normalaluminum hydroxide finished product, thereby greatly reducing the cost of the aluminum hydroxide finished product and reducing the cost of ton products of the aluminum hydroxide and aluminum fluoridejoint production by 12 to 40 yuan as well. The process realizes the reutilization of resources, accords with sustainable development strategy, and has higher economic benefit and social benefit.