The invention provides an adjustable solar rainwater collecting pool and a control method thereof. The adjustable solar rainwater collecting pool comprises a pool body, a storage battery and a plurality of plates, one end of the pool body is open, each plate is shaped like a circular-arc-shaped sheet, the side, facing the upper part, of each plate is an inwards sunken face, the side, facing the lower part, of each plate is an outwards convex face, flexible solar cell panels are fixedly arranged on the inwards sunken face, one ends of the plates are hinged to the edge of the open end of the pool body through hinge shafts, the other ends of the plates extend outwards, and the flexible solar cell panels and the storage battery are electrically connected. The control method comprises the stepthat the angles between the plates and the horizontal plane are adjusted according to the change of weather information. By adopting the technical scheme, according to the weather situation, a drivingmotor drives the plates to be turned over, thus the angles between the plates and the horizontal plane are changed in real time, and the effects that rainwater and sunlight are fully collected, the adjustable solar rainwater collecting pool is prevented from being scoured by rain and snow, and stable and reliable working of the adjustable solar rainwater collecting pool is ensured are realized.