The invention discloses a communication signal enhancement device. The communication signal enhancement device comprises a frequency selection circuit, an amplification and filtering circuit and a power enhancement emission circuit, wherein a communication signal input by the input end is coupled and then sent to the LC circuit for frequency selection; clutters in a non-communication signal frequency band are filtered; the current is amplified by the MOS transistor and flows into the input end of the amplification and filtering circuit; the amplification and filtering circuit is composed of asecond-order RC filter and a same-direction proportional operational amplifier A1; an output signal of the frequency selection circuit is processed by the second-order RC filter and then flows into the operational amplifier A1 to be amplified; the signal is enabled to reach a communication frequency range and an amplitude range; the filtering performance is effectively improved, and signals are stabilized, and noise is reduced; and triodes VT1-VT3 are adopted to form a composite tube to carry out power amplification on the signals, so that static loss is reduced, and signal power is effectively improved, so that transmitted signals are greatly enhanced, and great development value and practical value are achieved.