The utility model relates to the technical field of liquid preparation jet pipe joints and in particular relates to a liquid preparation jet pipe joint convenient for dissolution. The pipe joint comprises a joint body and connecting flanges, wherein the joint body comprises a first wide diameter pipe section, a first shrinkage pipe section, a first throat pipe section, a first expansion pipe section, a second wide diameter pipe section, a second shrinkage pipe section, a second throat pipe section, a second expansion pipe section and a third wide diameter pipe section; the inner diameters of the first and second throat pipe sections are smaller than those of the first, second and third wide diameter pipe sections. The pipe joint has the beneficial effects that the pipe joint has a reasonable and compact structure and is convenient to use; through two-time mixing in the first and second shrinkage pipe sections, dissolution of powder can be promoted rapidly and the dissolution rate of fracturing powder in water is increased; the fracturing powder and water are mixed fully and uniformly, the dissolution quantity of the fracturing powder in prepared fracturing fluid is high and the fracturing performance is good, thus improving the fracturing efficiency in the fracturing operation process; meanwhile, the pipe joint saves energy and is simple and convenient to use.