The invention discloses an optical pickup head which has a diffusion structure and is used for fetching an object. The optical pickup head comprises a hollow shell, a light source module, the diffusion structure and a sensitization module. The light source module is fixed in the hollow shell and provides an initial beam. The diffusion structure is connected to the hollow shell and receives the initial beam, and processes the initial beam into an even beam. The initial beam is reflected for a plurality of times in the diffusion structure to form the even light. The sensitization module is fixed in the hollow shell to sense the even beam reflected by the object, wherein, one optical axis of the sensitization module is substantially parallel to an axial direction of the diffusion structure.