Disclosed is a shield for eyelash extension of an eyelash extension system for extending a subject's eyelashes by bonding fake eyelashes thereto. The shield includes a safety cover divided into an upper body and a lower body such that front ends of the upper body and the lower body are paired to be opened or closed together to bite a subject's eyelashes placed therebetween. The safety cover includes a concave curved receiving groove in a front end of the safety cover to accommodate the subject's eyelashes while in contact with a protruding eye of the subject with his or her eye closed, and a work space with an entrance open to a rear side is provided behind the receiving groove. The work space is for accommodating the eyelashes pulled by being bitten between the front ends of the upper and lower bodies and conducting eyelash extension work therein.