The invention provides a kit for assessing a function of cytotoxic immune cells in human peripheral blood and an assessment method. The kit for assessing the function of cytotoxic immune cells in human peripheral blood provided by the invention comprises an anti-human CD3 antibody, an anti-human CD8 antibody, an anti-human CD45RA antibody, an anti-human CCR7 antibody, an anti-human CD28 antibody,an anti-human CD38 antibody, an anti-human CD57 antibody, an anti-human HLA-DR antibody, an anti-human PD-1 antibody, an anti-human CD56 antibody, an anti-human CD94 antibody, an anti-human NKP30 antibody, an anti-human NKP46 antibody, an anti-human NKG2D antibody, an anti-human KIR antibody, an anti-human Gamma Delta antibody and an anti-human V Delta 2 antibody, wherein all the antibodies are labeled by fluorescein. The kit for assessing the function of cytotoxic immune cells in human peripheral blood provided by the invention can be used for comprehensively assessing the immunity function of the cytotoxic immune cells in human peripheral blood, and is convenient and safe for use.