Prefabricated pier column prefabricated through post-reinforcement method

The utility model relates to a post-reinforcement method prefabricated assembly type pier column which comprises at least two prefabricated sections, a positioning block is arranged on the top of each section, a positioning groove is formed in the bottom of each section, a plurality of main reinforcement preformed holes which are vertically through are formed in each section, the prefabricated sections are in butt joint on a bearing platform, the bearing platform is provided with a positioning block, and a threaded sleeve is embedded in the bearing platform. The positioning groove at the bottom of the lowermost section is matched with the positioning block on the bearing platform, and the positioning groove of the upper section is matched with the positioning block of the lower section; a main reinforcement is inserted into each main reinforcement preformed hole of each section, the upper end of each main reinforcement is in threaded connection with the lower half part of a threaded sleeve, the lower end of t