The invention discloses electrically conductive printing ink for printing circuit strips on a flexible circuit board, which does not contain high molecular weight halogenated polymer and can improve the fold resistance of printed circuit strips. The electrically conductive printing ink, totally 100 percent, comprises the following components by weight percentage: 50 to 70 percent of silver powder,10 to 20 percent of halogen-free high molecular weight halogenated polymer, 10 to 30 percent of solvent and 0.01 to 2 percent of assistant, wherein the silver powder consists of flake silver powder with small and big grain diameters and is capable of ensuring excellent conductivity and reducing the folding damages to the printing ink circuit strips; the assistant is used to improve the fold resistance of the silver powder with big grain diameter in advance to reduce the negative effects of the silver powder with big grain diameter on the fold resistance; and the high molecular weight polymerconsists of polyurethane rubber and polyurethane resin, improves the fold resistance of the fold resistance of the circuit stripes printed by using high-conductivity printing ink, has a proper viscosity, and facilitates printing. The circuit strips printed by using the electrically conductive printing ink have fold resistance that is equal or exceeds that of circuit strips printed by using halogenated polymer conductive printing ink.