The invention discloses salicylaldoxime ester compounds with a structure shown in formula I. A substituent group R of the salicylaldoxime ester compounds is selected from C1-C8 alkyl, or selected fromcyanogroup, halogen, phenyl, C1-C4 alkoxy, C1-C4 alkyl sulphanyl substituted C1-C8 alkyl, or selected from phenyl, or selected from phenyl with 1-3 substituent groups, wherein the 1-3 substituent groups on phenyl are selected from halogen, hydroxyl, carboxyl, nitryl, cyano group, phenyl, phenoxyl, benzoyl, C1-C8 alkyl, C3-C8 naphthenic base, C1-C4 alkoxy, C1-C4 halogenated alkyl, C1-C4 halogenated alkoxy, C1-C4 halogenated alkyl sulphanyl and C1-C4 halogenated alkyl sulfonyl. According to a synthesis route of the salicylaldoxime ester compounds, 4-methoxyl salicylaldehyde and hydroxylamine hydrochloride are taken as raw materials. The method is used for the first time for synthesis of the compounds and has the advantages that the yield is high, separation is easy and the like. The compounds have better bacteriostatic activity for multiple agricultural pathogenic fungi.