The invention discloses a hydraulic reclamation soft area foundation treatment method. The method comprises the following steps that S1, hydraulic reclamation is carried out on soft soil to form a first hydraulic reclamation soil layer; S2, vacuum preloading treatment is carried out; S3, a plurality of first steel pipes are arranged in the first hydraulic reclamation soil layer; S4, first geobagsare filled with gravels; S5, a horizontal plate is arranged, and a plurality of first gravel piles are formed through grouting; S6, a plurality of second steel pipes are arranged at intervals, and hydraulic reclamation is carried out on soft soil to form a second hydraulic reclamation soil layer; S7, any second steel pipe is filled with gravels, and vacuum preloading treatment is conducted; S8, third steel pipes sleeve the second steel pipes, and and hydraulic reclamation is carried out on soft soil to form a third hydraulic reclamation soil layer; S9, the steps S7-S8 are repeated to form an Nth hydraulic reclamation soil layer to reach a set height; S10, vacuum preloading treatment is carried out; and S11, high-pressure grouting is conducted to form a plurality of second gravel piles. Themethod has the beneficial effects of being good in reinforcing effect, high in foundation bearing capacity and uniform in bearing capacity distribution.