The invention discloses a detection circuit of output power. The detection circuit comprises a
power output circuit, a power detection circuit and a
control circuit; the
power output circuit comprises a first
intermediate frequency filter, a first
amplifier, a first attenuator, a second
amplifier, a second attenuator, a first mixer, a first filter, a third
amplifier, a first coupler, a third attenuator, a fourth attenuator, a second filter and a second coupler; the power detection circuit comprises a first detection circuit and a second detection circuit; the first detection circuit comprises a fixed attenuator, the input end of the fixed attenuator is connected with the
coupling end of the second coupler, and the output end of the fixed attenuator is connected with a first AD detection module; and the second detection circuit comprises a fifth attenuator, a fourth amplifier, a fifth amplifier, a second mixer, a third filter, a second
intermediate frequency filter, a first single-pole double-throw switch and a second single-pole double-throw switch. The circuit can realize
power output in a range of more than 95dB, and can carry out real-time detection.