The present invention provides a long afterglow luminescent material, the chemical formula of which is shown in formula (I): K1-x-y-z-a-bLiaNabGa1-cAlcGe1-dSidO4: xBi3+, yM2+, zR3+, formula (I); formula ( In I), M is one or more of Mg, Ca, Sr, Ba and Zn; R is Sc, Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm One or more of , Yb and Lu; 0.0001≤x≤0.20, 0≤y≤0.20, 0≤z≤0.20, 0≤a≤0.20, 0≤b≤0.20, 0≤c≤0.20, 0≤ d≤0.20. The long afterglow luminescent material provided by the present invention uses Bi3+ ions as active ions, which can be effectively excited by ultraviolet light to produce cyan-blue color with adjustable long afterglow, high afterglow brightness and long time.