The invention belongs to the field of building materials, and particularly relates to a method for rapidly and continuously representing cement hydration degrees by means of a low-field nuclear magnetic resonance technology. The method comprises the following steps that 1, slurry is prepared, weighing is conducted, the water content m<0> and the cement content m<c> in the cement slurry are calculated, the slurry is rapidly put in a low-field nuclear magnetic resonance instrument, and test is conducted after system parameters and sampling interval time are set; 2, a CPMG impulse sequence is adopted to collect nuclear magnetic resonance transverse relaxation decay signals at t moments in different hydration time; 3, first echo peak amplitudes I(t) of a decay curve at the t moments in the different hydration time are automatically collected, and an amplitude I<0> of a first collection point is recorded; 4, physical combined water amounts m(t) at the hydration t moments are determined through the specific value of the I(t) to the I<0>, and hydration degrees alpha(t) at the hydration t moments are obtained according to the formula in the specification; 5, a relation curve of the alpha(t) and t is drawn, and the hydration degrees at any hydration t moment can be read. According to the method for rapidly and continuously representing the cement hydration degrees by means of the low-field nuclear magnetic resonance technology, drying or stopping of hydration to samples is not needed, and in-situ detection and continuous monitoring to the cement hydration degrees can be achieved.