A power-saving flowerpots capable of serial connecting with other flowerpot includes a planting tank having a horizontal plane and an inclined plane at an upper side thereof for planting; a water tank connected to a lower side of the planting tank; the connection of the planting tank and the water tank being formed as an L shape; an interior of the water tank being formed with a water draining channel; an upper side of the water draining channel being formed with a communication hole so that when the water level in the water tank is over a lower edge of the communication hole; water will flow into the communication hole from the water tank. A plurality of flowerpot can be installed as a first row by a retaining rod to pass through all hooks of the flowerpots; and the water tubes of the flowerpot are connected one by one.