A liquid-storing planting device is disclosed. The liquid-storing planting device includes a first box and a second box. The first box includes a plurality of lateral walls and a plurality of first through holes formed on the lateral walls. A tubular body is inserted into the first through hole to connect and communicate two adjacent first boxes. A supporting member is mounted within the first box. A second box is tacked on the first box. A plurality of second through holes are formed on the second box. Each of the second through holes is provided with a liquid absorbing strip. The liquid absorbing strip hangs down to the inside of the first box through the second through hole. The liquid stored in the first box is transferred to the second box by capillary effect of the liquid absorbing strip so as to provide a friendly planting environment.
