The invention relates to a method for treating a soft soil foundation/mine tailings/lake sludge by means of booster vacuum preconsolidation, which belongs to a construction method for the soft soil foundation/the mine tailings/the lake sludge, wherein insides of a plurality of rows of plastic drainage plates which are horizontally distributed inside soil mass/the slag/the sludge are subjected to vacuum pumping, and partial soil mass/ partial slag/ partial sludge between the plastic drainage plates is subjected to uniform supercharging simultaneously. The method can really reflect the reinforcing mechanism and the reinforcing effect of vacuum precompression on cohesive soil, tailing dam slag and the lake sludge, improves the consolidation depth by one time, shortens half of the reinforcingtime, has low manufacturing cost, and is safe and effective.