White light emitting glass ceramic and its manufacturing method, and LED device

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A white light emitting glass-ceramic. The chemical formula of the glass-ceramic is aSiO 2 ·bAl 2 O 3 ·cNaF·dCeF 3 ·nDyF 3 ·mAg, wherein a, b, c, d, n and m are, by mol part, 25~50, 15~30, 10~30, 10~25, 0.01~1 and 0.01~1, respectively, and a+b+c+d=100. A method for producing said glass-ceramic is also provided. Silver ion is doped in the glass-ceramic in the form of silver particles by means of sintering and reduction annealing treatment, and thus the luminescence properties of rare earth ion is improved.