The title compound N-(tert-butyl)-N’-(2-(4-chlorophenyl)acetyl)-5-methyl-1,2,3-thiadiazole-4-carbohydrazide (C16H19ClN4NaO2S, Mr = 366.86) has been synthesized, and its structure was characterized by IR, 1H NMR, H RMS and single-crystal X-ray diffraction. The crystal of the title compound belongs to triclinic, space group Pī with a = 8.464(2), b = 10.192(2), c = 11.757(2), α = 68.48(3), β = 76.31(3), γ = 80.86(3)°, Z = 2, V = 2024.6(10) 3, Dc = 1.333 g/cm3, μ = 0.339 mm-1, F(000) = 384, R = 0.0450 and wR (Ⅰ > 2σ(Ⅰ)) = 0.1234. X-ray analysis indicates one N-H…N intermolecular hydrogen bond and no π-π stacking interactions are observed in this crystal structure. The preliminary biological test shows that the title compound has fungicidal activity and antivirus activities against tobacco mosaic virus.