The present invention relates to the field of supported metallocene catalysts, and discloses a supported metallocene catalyst, a preparation method and applications thereof, and a methyl acrylate preparation method. The catalyst comprises a carrier and a metallocene compound supported on the carrier, wherein the carrier is a spherical small-particle size mesoporous composite material, and the metallocene compound has a structure represented by a formula I. According to the present invention, the supported metallocene catalyst has advantages of good catalytic activity, high efficiency and recycling. The formula I is defined in the specification, wherein R1, R2, R3, R4, R5, R1', R2', R3', R4' and R5' are respectively and independently hydrogen or C1-C5 alkyl, at least one of R1, R2, R3, R4 and R5 is C1-C5 alkyl, at least one of R1', R2', R3', R4' and R5' is C1-C5 alkyl, M is one of titanium, zirconium and hafnium, and X is a halogen.