The invention discloses a furanosyl modified 1,3,4-thiadiazole derivative and a preparation method thereof as well as application of the derivative as bactericide. The structural formula of the derivative CAU-2010-ZJ is as shown in a formula I. In the formula, R is acetyl, allyl, propargyl, methyl or ethyl; and R' is isopropyl, naphthaline, phenyl or phenyl having 1-2 substituted groups, wherein the substituted groups are halogen, methyl, methoxy, nitro, trifluoromethyl, or heptafluoro isopropyl. The preparation method comprises the following steps: carrying out a condensation reaction on a compound as shown in a formula II and N-substituted thiosemicarbazide so as to obtain thiosemicarbazone; and then carrying out a MnO2 ring-closing reaction so as to obtain a compound as shown in the formula I. The result of a bactericidal activity assay indicates that the compound CAU-2010-ZJ and a preparation thereof have good growth inhibition effect on sclerotium germs, eggplant early blight germs, gray mold germs, seedbed rhizoctonia solani germs, rice blast germs, asparagus stem blight germs, pythium germs, damping-off fungi, peanut black spot germs, white rot germs, tomato leaf mildew germs and watermelon anthrax. The formula I and formula II are as shown in the specification.