The invention relates to a tanker, a tank body and a tank body manufacturing method. The tank body comprises two drums symmetrically connected on the left and right, and two end sockets connected with the outer ends of the two drums correspondingly. Each drum is formed by splicing and then coiling a plurality of flat plates in different widths, and the bottom surface of each formed drum is a flat and straight inclined surface. The tanker comprises the tank body. The tank body manufacturing method comprises the steps that the multiple flat plates in different widths are spliced into a whole plate in a welded mode; each drum is formed by coiling one whole plate formed through splicing; the two drums are subjected to butt welding; and the two end sockets are welded to the outer ends of the two drums correspondingly, and the tank body is formed. By means of the tanker, the tank body and the tank body manufacturing method, the problems that in the prior art, a tank body of a tanker is prone to deformation, the manual welding workloads are heavy, the welding seam quality is difficult to ensure, and the cost is high are solved.