The invention discloses a hardware structure of a radio frequency transceiver, realizing two-way communication and relay functions. A single chip microcomputer ATMEGA16L-8AI is connected with a radio frequency wireless module through a slot interface CON11 and realizes the receiving or transmission of a radio frequency signal through the setting of RX or TX working mode of the module. The equipment address of the radio frequency communication is of 8-bit; wherein, the former 4-bit is of the equipment type address and is set by the software; while, the last 4-bit is of the equipment address and is set by the read dial switch state of the single chip microcomputer. The single chip microcomputer realizes the radio frequency control or relay function through the slot interface CON2 by the short connection or disconnection of the two pins of the slot with a jumper. The invention simultaneously realizes the radio frequency wireless module protocol of the radio frequency transceiver and the RS485 network protocol. With the adoption of a plurality of slots with corresponding sockets, the invention accesses or extends the function module by a plug-in type, which is easy and feasible and is able to realize the procedure downloading to update the processs of the microprocessor.