The invention discloses a preparation technology and preparation equipment for high-imitation cotton porous superfine profiled polyester fiber. The technological flow is as follows: polyester chips are dried, the dried polyester chips are placed in an extrusion device, polyhydric alcohol is added in an online manner to carry out blending modification, and then melt is obtained; the melt is filtered and enters a spinning manifold, the filtered melt is subjected to section superfine processing and section profiled processing, the melt is extruded by a profiled spinning plate, and then melt trickle is obtained; circular blowing cooling solidification forming is then carried out, and then filaments are obtained; and then the filaments are wound and formed sequentially through oiling by an oil nozzle, pretangle and heat setting. The preparation equipment comprises a drying device, an extrusion device, a filter device, the spinning manifold, a circular blowing cooling solidifying device and a winding forming device, which are connected in sequence, wherein the extrusion device is connected with an online adding device. The preparation technology and the preparation equipment have the characteristics of moisture absorption, breathability, anti-static electricity, pilling resistance, softness and bulkiness, soft gloss, moisture wicking and discharging, soft touch sense, better surface coverage and bending resilience, and also can realize a high-imitation cotton effect.