The invention discloses a carrier tracing loop of digital TV ground broadcast in the digital signal transmission domain, which comprises the following parts: equalizer FIR, DFE, complex multiplier, adder, judger, subtracter, real multiplier, accumulator and loop low-pass filter, wherein the demodulated complex signals is composed of I and Q paths, which is output as complex signal through equalizer FIR; the complex signal is multiplied by total phase difference phi with real baseband signal being fetched out in the adder with DFE output, which obtains the output of equalizer; the judger disposes the signal, which enters into subtracter after DFE; the signal and imaginary part Q' output by equalizer FIR are sent in the real multiplier; the signal is sent in the accumulator to eliminate phase-detector noise, which outputs driving frequency error signal delta f of digital control oscillator.