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In this paper, we introduce the notions of a $3$-$Lie_\infty$-algebra and a3-Lie 2-algebra. The former is a model for a 3-Lie algebra that satisfy thefundamental identity up to all higher homotopies, and the latter is thecategorification of a 3-Lie algebra. We prove that the 2-category of 2-term$3$-$Lie_\infty$-algebras is equivalent to the 2-category of 3-Lie 2-algebras.Skeletal and strict 3-Lie 2-algebras are studied in detail. A construction of a3-Lie 2-algebra from a symplectic 3-Lie algebra is given.

$3$-$Lie_\infty$-algebras and $3$-Lie 2-algebras