The invention discloses a system for predicting ramp gradient and slope length in advance by using vehicle ultrasonic radar. The system comprises a hardware system and a software system, wherein the hardware system comprises a vehicle ultrasonic radar, a rotary joint system, a single-chip microcomputer, a Y-type support, and a temperature sensor, a vehicle speed sensor, a tire pressure sensor, andthe display. The software system comprises a filtering module, an ultrasonic radar control module, a rotary joint control module, a ramp prediction mode selection module, a gradient and slope lengthcalculation module, and a gradient and slope length value selection module. In a dynamic working condition of a vehicle, the system can realize prediction of gradient and slope length of a single rampand a continuous ramp in advance, and accuracy is high, and calculation capability on a processor is low.