The invention relates to a chemical industry pressure vessel tank body fabrication method. Equipment used in the chemical industry pressure vessel tank body fabrication method comprises an installation plate, position adjusting devices, a detection device, two locking devices and two center adjusting devices, wherein the upper end of the installation plate is provided with the position adjusting devices, the upper ends of the position adjusting devices are provided with monitoring devices, the lower ends of the position adjusting devices are provided with the locking devices in a bilateral symmetry manner, and the inner sides of the locking devices are provided with the center adjusting devices. By means of the chemical industry pressure vessel tank body fabrication method provided by theinvention, the problems that when a chemical industry pressure vessel is fabricated manually, the chemical industry pressure vessel is firstly fixed and spliced and then is welded, then concentricitydetection is performed after welding is finished, and the chemical industry pressure vessel single-time fabrication process is tedious; when existing chemical industry pressure vessel fabrication equipment performs fabrication, the chemical industry pressure vessel is firstly fixed and welded and then is detected after the welding is finished, the process of detecting after the welding is prone tocausing the concentricity of the fabricated chemical industry pressure vessel to be inaccurate, and repairing needs to be performed on the fabricated chemical industry pressure vessel again; and thelike can be solved.