The invention relates to the dispensing industry, in particular to a complicated workpiece dispensing method and a device based on stereoscopic vision guidance. The method comprises the steps of adopting two high-definition industrial cameras to build a space coordinate system; then carrying out visual recognition analysis on a workpiece to be processed in the coordinate system so as to obtain a corresponding three-dimensional space coordinate; guiding the dispensing device to move along a space trajectory; when the slope k1 of a curved surface equal to delta x/delta z and the slope k2 equal to delta y/delta z are less than 1, adjusting the dispensing speed according to the movement speeds of a movement mechanism in an X direction, a Y direction and a Z direction so as to control the output quantity; and when the slope k1 of the curved surface equal to delta x/delta z and the slope k2 equal to delta y/delta z are larger than 1, keeping the constant dispensing speed, and ensuring the accurate dispensing consistency through adjusting the movement speed of a platform.