The invention discloses a device and a method for improving the soil resistance to liquefaction of submarine pipeline landing section interval.The devicefor improving the soil resistance to liquefaction of submarine pipeline landing section interval comprises a soil covering unit, a wave force dispersion unit and an auxiliary drainage unit, wherein the soil covering unit comprises a weighted base disposed in the trench and a temporary covering body arranged above the weighted base; the wave force dispersion unit includes a curved pad arranged in the trench backfill; the auxiliary drainage unit includes a drainage sleeve disposed on both sides of the soil weight unit and a backfill gravel arranged in the drainage sleeve. According to the device and the method for improving the soil resistance to liquefaction of submarine pipeline landing section interval, the soil is strengthened and compacted by increasing the heavy load of the soil;the auxiliary drainage unit is arranged, sand gap isreduced,and sand drainage ispromoted; and at the same time, the upper wave force dispersion unit is installed after the pipe is backfilled, and strives to further enhance the anti-liquefaction ability of the sand layer on the pipeline route of the submarine pipeline landing section, improves the stability of the soil in the landing section of the submarine pipeline, and ensures the operation safety of the pipeline.