Assembly type square reinforced concrete column and reinforced concrete foundation connecting joint structure and construction method

The invention discloses an assembly type square reinforced concrete column and reinforced concrete foundation connecting joint structure. The assembly type square reinforced concrete column and reinforced concrete foundation connecting joint structure comprises a square reinforced concrete column, a vertical fixed connecting part and a reinforced concrete foundation; the vertical fixed connectingpart is formed by four square steel plates and multiple split bolts, a square connecting base is arranged at the upper end of the reinforced concrete foundation, a vertical steel reinforcement framework is arranged in the square connecting base, the lower end of the vertical steel reinforcement framework extends into the reinforced concrete foundation, multiple bolt holes are transversely and correspondingly formed in two opposite sides of the bottom of the square reinforced concrete column and the top of the square connecting base, the square reinforced concrete column and the square connecting base are fixedly conne