The invention relates to an adjustable and controllable simulated rainfall device, and belongs to the technical field of artificial rainfall. The adjustable simulated rainfall device comprises lifting systems, a rainfall system, a control system and a water supply system, wherein four sets of lifting systems are provided, and construct four support legs of the device; the rainfall system consists of rainfall rods; the control system comprises two stepping motor chain wheels, two stepping motors, a rainfall angle adjusting chain, a solar panel, a rainfall angle adjusting chain wheel, a rainfall angle tail end controller, a rainfall density tail end controller, a rainfall density adjusting chain, a pressure roller base, a pressure roller and a rainfall density adjusting chain wheel; and the water supply system comprises a telescopic hose, an adjustable one-way valve, a speed regulating motor, a hydraulic motor, a water pipe and a water tank. The adjustable and controllable simulated rainfall device is convenient to install, the rainfall density and the raindrop falling angle can be changed at any time, the rainfall uniformity is high, natural rainfall in different areas under different climate conditions can be well simulated, and the research of water and soil loss under variable rainfall conditions is well facilitated.