A safety cord connector for a window blind includes a first half shell and a second half shell combined with the first half shell in such a way that a positioning protrusion extending from an inner surface of the second half shell is inserted into a positioning notch formed on an inner surface of the first half shell so as hold the first and second half shells together. When an external force exceeding the engaging force between the positioning protrusion and the positioning notch exerts between the first and second half shells, the positioning protrusion will separate away from the positioning notch to enable the combined first and second half shells to be split from each other so as to enhance safety in use.