The invention discloses a technological plastic flower which comprises an elastic flower stalk portion in the shape of a hollow tube, an elastic torus portion connected to the upper end of the flower stalk portion in a sealed mode, and a plurality of petal portions fixedly connected to the upper end of the torus portion. A lower sealing end is fixedly connected to the lower end of the flower stalk portion. One or more water inlets are formed in the lower sealing end. A cylindrical water absorption resin block is contained inside the flower stalk portion. A piston portion is formed at the upper end of the water absorption resin block. A plug end is formed at the lower end of the water absorption resin block. A one-way valve is installed on the inner side of the lower sealing end. The water absorption resin block is contained in the flower stalk portion, after the technological plastic flower is inserted into a flower vase containing water, water permeates the flower stalk portion from the water inlets under the guiding of cotton threads, the water absorption resin block absorbs water and expands, and the air pressure of the upper portion of the flower stalk portion and the interior of the torus portion is increased, so that the top of the torus portion protrudes upwards, the petal portions on the torus portion are expanded outwards, the interestingness is strong, and the technological plastic flower is suitable for being adopted as a holiday gift.