The present invention relates to a high-temperature solid-phase preparation method of structure-loose long afterglow luminescent material in field of inorganic luminescent material. It is characterized by that said invention uses any one of strontium hydroxide monohydrate and strontium hydroxide as strontium source and any one of aluminium oxide and aluminium hydroxide as aluminium source as base material and adds rare earth excitation agent, lattice defect agent and reducing agent, and makes the above-mentioned raw materials undergo the processes of mixing, decomposition, phase conversion, reduction and pulverization so as to obtain the invented product. |