The application provides a digital-phase-locked-loop-based resonator. The digital-phase-locked-loop-based resonator comprises a digital phase-locked loop, a direct digital frequency synthesizer and an analog-to-digital converter. The output terminal of the analog-to-digital converter is connected with a first input terminal of a digital phase frequency detector of the digital phase-locked loop; and the output terminal of the digital phase-locked loop is connected with the direct digital frequency synthesizer. Four channel output terminals of the direct digital frequency synthesizer are respectively connected with low-pass filters in a one-to-one correspondence mode; the output terminal of the second low-pass filter is connected with a first input terminal of a first adding device; the output terminal of the third low-pass filter is connected with a second input terminal of the first adding device and the output terminal of the first adding device is connected with a sensor; a first input terminal of a second adding device is connected with the sensor; and the output terminal of the fourth low-pass filter is connected with a second input terminal of the second adding device. The output terminal of the second adding device is connected to the analog-to-digital converter by a controller; and the output terminal of the first low-pass filter is connected to a clock signal input terminal of the analog-to-digital converter by a Schmitt trigger. With the digital-phase-locked-loop-based resonator, signal attenuation in the optical fiber transmission can be effectively compensated; and the transmission distance is extended.