The invention discloses a large-thickness sand filling construction technology for an embankment. The large-thickness sand filling construction technology includes the following steps that soft foundation underload prepressing treatment is conducted on embankment sand filling, sand and pebbles are used for foundation shaping to form a two-way cross slope, and the compaction degree reaches 90% or more; a sand and pebble layer with the thickness of 50 cm is laid on the foundation; after being fully watered, the sand and pebble layer is rolled until the compaction degree reaches 93% or more; the laying thickness of a sand layer is controlled at 70 cm; the optimal water content of the sand layer is kept in a manual watering mode; actual wide filling of lime surrounding soil is controlled to be 2.5 m, the lay-down thickness is controlled within 30 cm, and after rolling is completed and the surrounding soil passes inspection, slope cutting is conducted according to a design side boundary at the outer side of the surrounding soil. The sand filling lay-down thickness of the embankment can be increased substantially, the filling speed is more than two times that of a traditional thickness filling technology, the construction period can be saved by 48%, and according to direct economic benefits, paving cost per kilometer is reduced by 30% or more.