The application provides a linear frequency-modulation super-continuum spectrum delay circuit comprising a laser, an adjustable delay circuit, an electrooptical modulator, an optical spectrum analyzer and a boost output circuit. The output terminal of the laser is connected with the input terminal of the adjustable delay circuit; the output terminal of the adjustable delay circuit is connected with a first input terminal of the optical spectrum analyzer; the output terminal of the electrooptical modulator is connected with a second input terminal of the optical spectrum analyzer; and the output terminal of the optical spectrum analyzer is connected with the input terminal of the boost output circuit. The adjustable delay circuit can tune the wavelength of the coherent light source signal rapidly; on the basis of the mapping relation of the wavelength and time, signal delay at the timer shaft can be realized in the frequency domain and the bandwidth range of the optical fiber transmission is broadened. Rapid adjustment and optimization of the adjustable light source can be realized; the linear tuning can be carried out rapidly and simply; the signal jittering is low; and the output signal is stable. Moreover, the expanding performance of the rapid adjustable delay circuit is good; and the delay circuit is suitable for the network with wide bit rate range and long transmission distance.