The invention relates to a concrete preparation process, which comprises the following process steps: s1, uniformly stirring water and a surface wetting agent, adding a fine aggregate, and uniformly stirring to obtain a first mixture; wherein the weight ratio of water, fine aggregate and surface wetting agent is 1: (3-7): (0.01-0.03); s2, adding a gel material and a dispersant into the first mixture, and uniformly stirring to obtain a second mixture; wherein the weight ratio of gel material, fine aggregate and dispersant is 1: (1-1.4): (0.008-0.012); s3, adding a coarse aggregate, a fiber filler and water into the second mixture, and uniformly stirring to obtain a third mixture; wherein the weight ratio of fine aggregate, coarse aggregate, fiber filler and water is 1: (2-2.4): (0.06-0.1):(0.08-0.12); and s4, adding an additive into the third mixture and uniformly stirring to prepare concrete slurry; wherein the weight ratio of additive to fine aggregate is (0.02-0.03): 1. The workability and working performance of the mixed soil are improved by reasonably setting the feeding sequence of concrete raw materials.