The invention relates to a mechanical type extrusion forming device for a dimple heat transfer tube. The extrusion forming device is composed of motor driving systems, transmission systems, rack systems and pressure head systems. The extruding and forming device is characterized in that the transmission systems are connected with the motor driving systems, cover plates on the right ends of the transmission systems are connected with the rack systems through bolts, and clamping jaws on the left ends of the transmission systems are connected with the pressure head systems through bolts; and when the extruding and forming device works, small bevel gears engage with the bevel teeth of large bevel gears, the large bevel gears engage with the plane threads of the clamping jaws, the rotating motion of motors can be converted into the radial movements of the pressure head systems, and therefore pressure heads extrude polished tubes. Compared with the prior art, a plurality of sets of pressure heads are adopted to extrude the polished tubes, structural parameters such as the height, shape, number and installation distance of the pressure heads are changed, the dimple heat transfer tubes with different structural parameters can be manufactured, the processing and manufacturing efficiency is high, and the production cost is low; and in addition, synchronism of the motion of the pressure heads can be achieved through the planar screw drive, and therefore the consistency of the extruded dimple structural parameters is guaranteed.