The invention relates to the technical field of plastic flower pots, and discloses a self-pressing power conversion type plastic flower pot comprising a pot body. The bottom of the pot body is connected with a hollow base, the inner side of the hollow base is connected with a pressure conversion mechanism, and inner walls of the left and right sides of the pot body are fixedly connected with connecting mounting pieces through screws, liquid guide transmission mechanisms are welded and fixedly connected to the connecting mounting pieces, the inner side of the pot body is provided with a threadtransmission soil-loosening mechanism, the left and right sides of the pot body are provided with vent holes, the bottoms of the left and right sides of the pot body are provided with drain holes, themiddle position of the bottom of the pot body is fixedly connected with a connecting base block, and a gravity circular block is bonded to the middle position of the bottom of the inner side of the hollow base. According to the self-pressing power conversion type plastic flower pot, through the arrangement of the pot body, the hollow base, the pressure conversion mechanism, the connecting mounting pieces, the liquid guide transmission mechanisms, the thread transmission soil-loosening mechanism and the connecting base block for mutual cooperation, the problems that an existing plastic flowerpot is not high in water source utilization rate and a conventional soil loosening mode has a bad effect on plants are solved.