Forming technology of surface hydrophobic structure of polydimethylsiloxane three-dimensional micro fluidic channel

The invention provides a forming technology of a surface hydrophobic structure of a polydimethylsiloxane three-dimensional micro fluidic channel which is mainly applied to micro-droplet control of a micro fluidic chip, and solves the problems of fluid stuck to the inner wall face of a micro pipeline and mutual fusion of two phases. The forming technology specifically comprises the steps that (1) an UV-LIGA technique is used to manufacture a polydimethylsiloxane micro fluidic chip provided with a micro fluidic channel; (2) tensile force is applied to the two sides of the chip in the direction of the fluidic channel; (3) a metal wire with the diameter being smaller than the width of the micro fluidic channel is inlaid in the polydimethylsiloxane chip fluidic channel which is in the elastic deformation state; (4) a laser beam acts on the surface of the metal wire by penetrating through the polydimethylsiloxane material; and (5) a laser is shut down, and the tensile force is removed according to a certain rule. C