The invention discloses a signal waveform design method for a low probability of intercept radar communication integrated system, which overcomes the problems of poor distance resolution, speed resolution and low probability of intercept performance of a radar communication integrated signal. The method comprises the following implementation steps of (1) acquiring an information chip sequence; (2)establishing a mapping relation between an information chip and ae signal phase; (3) obtaining a phase-coded pulse signal; (4) obtaining a linear frequency-modulated baseband signal; and (5) obtaining a transmitting signal of the low probability of intercept radar communication integrated system. According to the method, the fluctuation of a signal fuzzy function near an original point is inhibited, the distance resolution and the speed resolution of a detection target of the system are improved, the phase agility of the transmitting signal of the radar communication integrated system and thecomplexity of a modulation mode are enhanced, the low probability of intercept performance of the radar communication integrated system is improved, and the method meets the precision requirement ofthe detection target of the radar communication integrated system in a complex electromagnetic environment and the requirement for the low probability of intercept performance of the radar communication integrated system.