The invention discloses pyrazole methanol ester compounds shown as the General Formula (I): wherein, R<1> expresses C1-C5 alkyl, phenyl or substituted phenyl; R<2> expresses C1-C5 alkyl or C1-C5 alkyl halide; R<3> expresses C1-C5 alkyl, C1-C5 alkyl halide, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl or hetero aryl; X expresses hydrogen, halogen, C1-C3 alkyl, C1-C3 alkoxy, nitro, cyano, sulfur cyano, trifluoromethyl sulfonyl or trifluoromethyl sulfinyl. The invention also discloses a preparation method and applications of the compounds. The pyrazole methyl ester compounds has excellent control efficiency on harmful pathogenic bacteria, harmful insects and mites and can be used for preparing insecticides, acaricides or fungicides for the agriculture, horticulture and floriculture fields. The pyrazole methyl ester compounds also can be used for preparing control agents of harmful living beings in the fields of forestry, animal husbandry and public health, etc.