An LED lighting device at least comprises a base made of metal materials; a substrate which is disposed on a surface of the base and has one electrode and at least one LED chip; and an insulation sheet which is disposed between the base and the substrate. The insulation sheet and the substrate satisfy the correlations L2+2×T≧L1+2×Cr, W2+2×T≧W1+2×Cr and Cr≧1.6 mm. By controlling the dimension of the insulation sheet, a creepage distance between the electrode and the base can be increased, so as to solve the safety problem of lighting devices without increasing manufacturing costs.