The invention provides a multifunctional agricultural planting box. The multifunctional agricultural planting box comprises an adjustable water storage box structure, a water circulating pump structure, a control device, a planting box structure, a fixed frame structure and a fixed rod; the planting box structure is installed on the upper portion of the adjustable water storage box structure through the fixed frame structure. Accordingly, by means of a fixed plate, a protection plate is fixed conveniently, and the phenomenon that when it is windy, plants in the planting box are destroyed is prevented; by means of a winding roller and a crank, a stay cord is matched, the area, above the planting box, of a sun cloth is facilitated, small plants can be prevented from being sunburned due to overheating of the sun, and the protection effect is improved; by means of a liquid level sensor, the phenomenon that when the water level is lower than the liquid level sensor, a signal is sent to a controller to make the controller control the circulating pump to stop working is facilitated, and the phenomenon that when no water exists in the water storage tank, the circulating pump still works is prevented; an adjusting pipe adopts a telescopic corrugated pipe, the angle of a water guide pipe can be adjusted according to the position of the circulating pump conveniently, and use is more convenient.