The utility model is applicable to the technical field of liquid preparation of self-diverting acid, and provides an on-site liquid preparation device for self-diverting acid, which comprises a support table, a liquid preparation cylinder is arranged on the support table, and a shaking component is arranged between the support table and the liquid preparation cylinder; a stirring
assembly is arranged on one side of the liquid preparation cylinder; the shaking
assembly comprises mounting grooves formed in the front side and the rear side of the upper end of the supporting table, first lead screw sliding tables are mounted in the two mounting grooves correspondingly, and the same bottom plate is arranged at the upper ends of sliding blocks of the two first lead screw sliding tables. The liquid preparation
barrel is driven to move left and right through the shaking
assembly, so that internal liquid shakes left and right, the stirring assembly is arranged, a cross stirring head can move up and down conveniently, up-and-down mixing is facilitated, the mixing uniformity is improved, the flow valve is arranged, the feeding amount of an additive is controlled conveniently, and therefore the liquid preparation efficiency is improved.