To address the challenge of achieving both wide-range coverage and high-precision delay in conventional laser echo simulators, we designed a fully digital, high-precision delay signal control system with coarse-fine tuning capability, implemented on an FPGA. The system employs a dynamic phase adjustment strategy that integrates a clock counter with a mixed-mode clock manager (MMCM). Coarse delay adjustment is performed using a 250 MHz system clock counter, while fine delay compensation is realized through MMCM-based phase interpolation with 17.857 ps resolution steps. Experimental results demonstrate that, within a simulation range of 300 m to 30 000 m, the delay accuracy is better than 6 ps, corresponding to a distance resolution of 0.01 m. In actual measurements, the delay accuracy exceeds 1.2 ns, equivalent to a distance resolution of 0.18 m. This system achieves precise delay control across a wide range, offering a robust and reliable solution for performance evaluation of pulse laser rangefinders.