Fracturing filling construction pressure limiting value monitoring control method

The invention discloses a fracturing filling construction pressure limiting value monitoring control method. The technical problem that whether wellhead pumping pressure is safe or not cannot be judged is solved. The method comprises the steps that the pumping pressure Pd of a drill rod at a wellhead is monitored; the pressure Pa at the annular wellhead is monitored; measuring and calculating the liquid column pressure Phs on the outer side of the blind pipe; measuring and calculating the liquid column pressure Phc on the inner side of the blind pipe; according to the formula that Pd + Phs < Pb + (Pa + Phc), whether the wellhead pumping pressure is within the safety range of the pressure limiting value or not is judged, if the wellhead pumping pressure meets the safety range of the pressure limiting value, constant pressure is kept for continuous production, and if the wellhead pumping pressure exceeds the safety range of the pressure limiting value, a pump is stopped for pressure relief; wherein Pb is the ex