The invention relates to the technical field of plant culture, and particularly relates to a plant water consumption measurement and water controlling device. The device comprises a sealing cover, a water seepage bucket body and a sealing bottom cover, wherein a first opening and a first through hole for the passing of plantlets are formed in the sealing cover, and the first opening cuts the side wall of the sealing cover and is connected to the first through hole; the walls of the two sides of the first opening are in disassembly connection, the sealing cover is in disassembly connection with a port of the water seepage bucket body and is in sealing connection with the port of the water seepage bucket body in use, and the sealing cover is covered on the bucket port of the water seepage bucket body in use; water seepage holes are formed in the bottom of the water seepage bucket body, the sealing cover is in disassembly connection with the bottom of the water seepage bucket body and is in sealing connection with the bottom of the water seepage bucket body in use, and a sealing bottom cover is placed below the bucket bottom in use. The plant water consumption measurement and water controlling device provided by the invention has the advantages that the airtightness is good, the result of the measured plant transpiration water consumption is exact, in addition, the device is also provided with a sealing gasket, a gasket and the like, so that the sealing effect of the whole water controlling device is further enhanced.