The present invention provides a digital time conversion system based on a parameter processing module and a phase-locked loop cascade. The technical problem is solved that the current digital time conversion system is narrow in application range. The digital time conversion system based on the parameter processing module and the phase-locked loop cascade comprises a parameter processing module (1), a time base generation module (2), an enabling control module (3) and a digital time conversion module (4); the parameter processing module (1) extracts four control parameters from the inputting arrangement parameters and outputs the four control parameters; the time base generation module (2) is internally provided with two phase-locked loop cascade structures to generate two time base signals being regulated by input arrangement parameters and having fixed frequency difference; the enabling control module (3) generates and outputs enabling signals according to the two time base signals; the time conversion module (4) employs the two time base signals to generate time interval signals in the control of the enabling signals. The digital time conversion system based on parameter processing module and phase-locked loop cascade is adjustable in output time interval resolution ratio and high in resource utilization rate and can be used for the fields of time frequency measurement, etc.