The invention relates to a protocol conversion gateway between an Internet field bus and a PROFIBUSDP field bus, namely a remote monitoring method based on an IPv6 and a PROFIBUS, and specifically speaking, the protocol conversion gateway serves as a bridge of two networks to achieve heterogeneous network connection, and remote monitoring on a PROFIBUS system is achieved. The protocol conversion gateway works in a transmission layer of an ISO/OSI reference model, information is received from one network and converted to be sent to the other network after protocol conversion, and data communication between the PROFIBUS and the Internet is achieved. According to the protocol conversion device, the flushbonding technology is adopted, and a flushbonading gateway hardware system based on an S3C2440 network card, a DM9000 network card and an RS-486 interface is designed. A software system comprising protocol conversion, data transmission and gateway control is designed based on the Linux operating system according to the protocol conversion process. The gateway comprises a PROFIBUS interface and an Internet interface at the same time, and can respectively process protocols and related information of the PROFIBUS and the protocols and the related information of the Internet. The gateway can be integrated with the Internet without abandoning an existing PROFIBUS control network.