The invention provides a saline-alkali soil permeable drainage planting system, which includes a drainage pipe assembly and a permeable plate assembly. The drainage pipe assembly is pre-embedded in asaline-alkali soil layer, the permeable plate assembly is fixedly connected to the surface of the drainage pipe assembly, the permeable plate assembly includes one or more curved permeable plates, a plurality of top curved arcs of the permeable plates extend to the surface of the saline-alkali soil layer, a plurality of bottom curved arcs of the permeable plates are connected to the surface of thedrainage pipe assembly, the permeable plates are internally provided with hollow permeable interlayers, and a plurality of permeable holes are formed in the upper surfaces and the lower surfaces of the permeable plates. The invention further provides a saline-alkali soil permeable method. According to the saline-alkali soil permeable drainage planting system, compared with the prior art, the material cost of the permeable pipes can be effectively lowered, and a fully covered permeable effect can be formed.