By means of soft set, the concepts of soft LI-ideals of lattice implication algebra are introduced, some of their properties such as intersection and AND are studied. Then its equivalent characterization is discussed. In addition, the relationship between a soft LI-ideal of lattice implication algebra and a soft lattice ideal of lattice implication algebra is investigated. The properties about image and preimage of a soft LI-ideal of lattice implication algebra are obtained.