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Here we report a simple synthesis of Ca-Al double substituted strontium hexaferrite Sr1-x/12Cax/12Fe12-xAlxO19. The rise of the substitution ratio x leads to decrease of magnetization, but significant increase of coercivity. At x = 4 the sample coercivity is 21.3 kOe, which is higher than for ε-Fe2O3 with the same magnetization of 15 emu/g. At x = 5.5 the coercivity reaches 36 kOe, which is the highest value known for ferrite materials.