The invention relates to an early-warning system based on stroboscopic information. The system comprises a sensing unit, an optical transmit-receive unit and a control unit. The sensing unit comprisesan optical modulation module and sensors. The optical modulation module is used for modulating an electrical signal carrying monitoring information sent by the sensor into an optical signal comprising at least two light-emitting phases in a light-emitting period, wherein at least one monitoring information is set in a manner of modulating luminescence time length, characteristic curve and/ or spectral change rules of light in at least one light-emitting phase, and at least one monitoring information, light intensity/brightness of which is approaching to zero candela change, is set in a mannerof modulating luminescence time length, characteristic curve and/ or spectral change rules of light in at least one light-emitting phase; and when at least one monitoring information in the optical signal received by the at least one optical transmit-receive unit is in an early-warning state, the control unit sends an early-warning instruction to the at least one optical transmit-receive unit andcontrols the at least one optical transmit-receive unit to project a guide light pattern corresponding to the safety level to indicate a safe route.