The invention discloses a plant cultivation device with functions of automatically supplementing water and fertilizers. The device comprises a main body, three support columns, a nutrition liquid storage chamber, a water storage tank, a center processing unit, a display screen, a temperature and humidity detector and a plant nutrition detector. The three support columns are provided with cameras, droppers, mist spray heads and small water pumps. The upper part of the main part is provided with a flowerpot groove. The nutrition liquid storage chamber is arranged around a flowerpot. The lower part of the flowerpot is provided with the water storage tank. The bottom of the flowerpot is provided with the center processing unit. A control switch and the display screen are arranged ahead of the main body. The plant cultivation device with functions of automatically supplementing water and fertilizers has the following beneficial effects: operation on monitoring watering and fertilizer application for plants is reduced for a user on a daily basis so that automated monitoring and refined cultivation of plants are achieved.