In the transportation process of production line, the numerical conversion between the actual value and the fuzzy universe is ignored, which leads to the poor effect and low stability of the transportation speed of the production line in different periods, and affects the operation of the transportation equipment of the production line. Therefore, a time-sharing control model of the transportation speed of the production line based on PLC technology is proposed. According to the technical characteristics of PLC, the conveying speed of the production line was calculated, and the quantization factor and scale factor were controlled in different periods to realize the conversion between the actual value of the input instruction and the fuzzy universe. According to the actual demand of the factory for the conveying speed of the production line, the control model of the conveying speed of the production line in different periods is established, and the calculation process of the quantitative factor and the scale factor is substituted to control the conveying speed of the production line in different periods. The experimental results show that the control effect of the conveying speed, the convergence speed of the motor speed waveform and the stability of the model are completely consistent with the speed stage changes generated by the actual control instructions. The maximum convergence speed of the motor speed waveform can reach 1100 r/min, and the amplitude margin is maintained at 10 deg/dB. The time control model of the transportation speed of the production line in this study can control the transportation speed of the production line in time according to the instructions, and in the process of controlling the production line, it has faster response speed and higher stability. The conveying speed of the production line is controlled in different periods, which provides a reference for the intelligent production line.