The invention relates to the technical field of potato seeding equipment, in particular to an all-filming double-furrow potato seeder applicable to an all-filming double-furrow potato seeding technology in arid areas in Northwest China. The all-filming double-furrow potato seeder comprises a frame (19), and is characterized that a fertilizer box (36), two seed boxes (29) and side supports (33) are arranged on the frame (19), furrow openers (1), soil taking shovels (4), soil lifting mechanism (25) and repressing forming mechanisms (27) are arranged on the lower portion of the frame (19), land wheels (39), earthing and ridging devices (26), hanging plates (14) and film supports (20) are arranged on two sides of the frame (19), hanging mechanisms (37) are arranged at the front end of the frame (19), seeding shafts are mounted on the side supports (33), and a chain spoon type seeding unit (30) is mounted between a land wheel axle and the corresponding seeding shaft. The two seed boxes (29) are parallelly mounted behind the fertilizer box (36), seed protecting grooves (31) are formed in two sides of the fertilizer box (36) and the front ends of the seed boxes (29), each chain spoon type seeding unit (30) is mounted between one seed box (29) and the corresponding seed protecting groove (31), reinforcing rods (32) are arranged on the side supports (33), the seed protecting grooves (31) are reinforced on the reinforcing rods (32), and the lower ends of the seed protecting grooves (31) are positioned in side wings (3) of the furrow openers (1). By the aid of the all-filming double-furrow potato seeder, integrated working including seeding, deep fertilizing, ridging, repressing and forming, full filming, soil lifting and soil covering is realized, and the problem about no assorted seeder for the all-filming double-furrow potato drought-resisting technology is solved effectively.