The invention discloses a solidification and stabilization treatment process for heavy-metal polluted soil. The process comprises heavy-metal polluted soil argillization, permanent-magnet strong magnetic separation, pollution degree gradation, medicament adding and stirring, and extrusion-compaction forming. In the process, no residual water and dust during a treatment process for the heavy-metal polluted soil is realized with the adoption of an accurate water control method; a part of heavy metals in the mud of the heavy-metal polluted soil is separated out with the adoption of a permanent-magnet strong magnetic separation method; the difficulty and the expense of later-period solidification and stabilization treatment for the mud of the heavy-metal polluted soil are reduced from the source; the soil after the permanent-magnet strong magnetic separation is treated according to pollution degrees respectively; the addition amount of medicaments is reduced; and uniform mixing and adequate reaction among a stabilizer, a solidifier and the soil are promoted, and repair quality is ensured with the adoption of a method of adding the stabilizer and the solidifier respectively, strongly stirring, and performing extrusion-compaction forming. The process has the characteristics of being saving in resource, low in cost, convenient in operation, high in repair efficiency and the like, and is widely suitable for solidification and stabilization repair for multi-heavy-metal polluted sites.