The trailer-mounted slope radar is a trailer-mounted circular arc synthetic aperture deformation monitoring radar. It is based on the frequency-modulated continuous wave radar body and achieves high-resolution imaging and sub-millimeter deformation measurement accuracy through circular arc synthetic aperture imaging and differential interferometry technology. It can conduct all-round, non-contact, and high-precision monitoring of the minute deformations of the monitored slope body. It features long distance, high deformation data refresh rate, strong environmental adaptability, good portability, simple operation and intelligent early warning. It can be applied to monitoring scenarios such as high and steep slopes, roadsides of highways and railways, geological disaster hazard points, tailings ponds (DAMS), open-pit mining areas, water conservancy projects and geological disaster emergency rescue. It is especially suitable for emergency rescue monitoring of geological disasters in the wild and long-term fixed monitoring scenarios in open-pit mining areas.