A slope water-soil loss experiment apparatus and method in combined extreme meteorological conditions. The experiment apparatus comprises an experiment table (1), a combined extreme environment simulation unit (2), and a control system unit (3). The experiment table (1) comprises a bottom base (4), a slope base plate (5), a downstream baffle plate (6), a soil block standard element (8), and an experiment table regulating apparatus. The combined extreme environment simulation unit (2) comprises a rainfall simulation device (13), an air field simulation device (14), a freezing rain simulation device (15), a snowfall simulation device (16), a sunlight simulation device (17), an air temperature simulation device (18), and an overland flow simulation device (19). The control system unit (3) comprises a power supply system (20), a water supply system (21), and a signal acquisition and processing system (22). The apparatus performs indoor simulation and measurement of a slope water body loss situation in a single or combined extreme meteorological conditions of rain storm, rain and snow, freezing rain, flood, drought, high temperature and the like, can produce accurate and reliable results, and can be widely used in water-soil loss monitoring, law analysis and governance in complex variable meteorological conditions.
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