The present invention is a delay line for automatically balancing process deviation and temperature influence, the delay line is connected in series by a plurality of delay units, each of the delay units includes a delay circuit and an inversion circuit; transistors P1, P2, P3, P4 is a PMOS transistor of the same size, and transistors N1, N2, N3, and N4 are NMOS transistors of the same size; the transistors P1, P3, N1, and N3 form one of the delay circuits; the transistors P2, P4, N2, and N4 One of the reverse circuits is formed. The delay line designed by the method of the present invention can automatically adjust the high and low level duty ratio of the delay unit, so that the high and low level duty ratio of the signal is approximately 1/2; the delay line designed by the present invention can effectively increase the frequency of the input signal The dynamic range can reduce the locking time of the delay-locked loop; the delay line designed by the invention has a simple structure and adopts standard CMOS electronic devices, which can effectively save chip area and cost.