Wireless signal extender

The utility model relates to a wireless signal extender. The wireless signal extender comprises a signal processing circuit and a power supply source circuit. The signal processing circuit comprises a micro control unit (MCU), the MCU is connected with the signal processing circuit and a signal transmission circuit, the signal processing circuit comprises an RF chip (radio frequency transceiving chip), the RF chip is connected with the MCU in a circuit, an RF power amplifier and a low-frequency narrowband band pass filter are sequentially connected after the RF chip, and the low-frequency narrowband band pass filter is provided with a signal transceiving antenna. The signal transmission circuit comprises a photoelectric isolation circuit connected with the MCU, an RS485 interface circuit is connected after the photoelectric isolation circuit, and the RS485 interface circuit is connected with a user terminal. By applying the technical scheme provided by the utility model, the wireless signal extender can enhance wireless signals and enlarges the coverage scope of micropower wireless signals.