We propose a radio-over-fiber (ROF) link delay measurement scheme based on time, frequency,and ROF signal simultaneous transmission to meet the large-range and high-precision delay measurement requirements of ROF links. One pulse-per-second (1PPS) is processed with subcarrier modulation, so that the ROF signal and the delay measurement signal are transmitted at the same wavelength, avoiding the interference of the 1PPS signal to ROF signal and achieving high-precision delay measurement and ROF transmission simultaneously. We build up an experimental system to measure the absolute delay of the ROF signal during the 25 km fiber link at severely changed temperature, which verifies the compatible characteristic of the ROF system and the time-delay measurement system. The experimental results show that the proposed scheme can measure high-precision and large-range link delay without ROF signal degradation.