The invention discloses a technological plastic flower which comprises an elastic hollow and tubular flower stalk portion, an elastic receptacle portion sealed and connected to the upper end of the flower stalk portion and multiple petal portions fixedly connected to the upper end of the flower stalk portion. A lower seal head is fixedly connected to the lower end of the flower stalk portion, and more than one water inlet hole is formed in the lower seal head. A cylindrical water absorbing resin block is installed in the flower stalk portion, a piston portion is formed at the upper end of the water absorbing resin block, a plug portion is formed at the lower end, and a one-way valve is installed on the inner side of the lower seal head. Water flows into water inlet holes to seep into the flower stalk portion after technological plastic flower is inserted into a vase containing water by installing the water absorbing resin block in the flower stalk portion, the water absorbing resin block absorbs the water to expand to make air pressures in the upper portion of the flower stalk portion and the receptacle portion rise, so that the top of the receptacle portion upwards protrudes, and the petal portions on the receptacle portion outwards spread. The technological plastic flower has good interestingness and is suitable for a holiday gift.