The utility model discloses a fieldbus data replication device, which realizes real-time and interference-free replication of communication data in the fieldbus link. The fieldbus data replication device is characterized by comprising an FPGA (field programmable gate array) module, a PCI (peripheral component interconnect) interface, and a plurality of fieldbus communication interfaces. Both the PCI interface and the fieldbus communication interfaces are connected with the FPGA module which replicates the data in the fieldbus link by the aid of the fieldbus communication interfaces, the replicated data are transmitted to the fieldbus link through the fieldbus communication interfaces or to external devices through the PCI interface. The fieldbus data replication device can realize real-time and interference-free replication of the data from one fieldbus link to another fieldbus link, solves communication problems among different fieldbus links, is applicable to different fieldbus protocols, is high in compatibility, and simultaneously realizes communication among fieldbus and devices with the PCI interfaces.