The invention discloses a high-speed railway plastic-flow-shaped soft soil foundation reinforcement method. According to the method, a high-speed railway plastic-flow-shaped soft soil foundation is reinforced with two foundation treatment methods that CFG piles are combined with drainage consolidation. The reinforcement method includes the following steps that first, relevant physical-mechanical indexes of plastic-flow-shaped soft soil are fount out, and the requirements which the cohesive force C and the inner friction angle phi of the plastic-flow-shaped soft soil need to meet are determined before the CFG piles are adopted for treatment; the drainage consolidation treatment is performed on the high-speed railway plastic-flow-shaped soft soil foundation to be reinforced; after the drainage consolidation soil body reaches strength required in the design, CFG pile construction is performed in the soil foundation to be reinforced, and the high-speed railway plastic-flow-shaped soft soil foundation can be reinforced. Compared with a traditional single technology, the technology that the CFG piles are combined with the drainage consolidation fully plays the advantages of the two foundation treatment methods, safety quality can be controlled, and operation safety of a high-speed railway is guaranteed.