The invention discloses an indoor analog experiment device for roadbed slope erosion. The indoor analog experiment device comprises a movable liftable slope analog device and an artificial rainfall analog device, wherein the movable liftable slope analog device comprises a base device, a panel groove device and a slope gradient adjusting device, the base device and the panel groove device are connected together through a movable hinge, and the panel groove device can rotate freely around the hinge; the artificial rainfall analog device comprises a water supply device, a support device and a spraying device, the water supply device comprises a water supply pool, a water pipe, a water pump, an adjusting valve, a branch valve and a hydrometric propeller, the support device comprises movable wheels, an expansion bracket, a transverse support rod and a longitudinal support rod, and the spraying device comprises a water guide pipe and a prayer head. According to the indoor analog experiment device, a large amount of roadbed slope erosion data is obtained under different working conditions and different rainfall conditions within a short period of time. The indoor analog experiment device is simple in structure, convenient to operate, safe and reliable, low in cost and high in efficiency, and is convenient to popularize and apply.