The invention discloses a carrier wave guide rail type ammeter. The carrier wave guide rail type ammeter comprises a body. The body comprises a first electrical part and a second electrical part, wherein the first electrical part comprises a signal collection end and a metering circuit connected with the signal collection end, the first electrical part and the second electrical part are connected with each other in an inserting mode, the second electrical part obtains electrical signals through an MCU in the second electrical part, conducts data processing, stores the signals through a first memorizer of the second electrical part and conducts carrier wave data communication through a built-in carrier wave module, electrical pins are arranged on the side of the first electrical part, and electrical insertion grooves matched with the electrical pins are formed in the side of the second electrical part so that insertion connection and combination can be achieved. The carrier wave guide rail type ammeter can be conveniently disassembled and assembled, a weak current part, namely, the second electrical part, can be taken down through installation personnel, the carrier wave module and the data are stored in the second electrical part, testing personnel can conveniently conduct testing, a strong current part, namely, the first electrical part, can still normally conduct metering or data collecting when the weak current part is detached, and the data can be correctly read in the reassembling process.