The utility model discloses a big air gap resonant mode linear induction motor utilizes primary winding and secondary's resonant coupling, realizes secondary induced -current's maximize. Its system composition does: establishing ties around three symmetrical primary winding (2) on stator core (1) and elementary building -out capacitor (3), letting in three symmetrical high -frequency alternating current, the department produces travelling wave magnetic field at the air gap. Secondary (4) structure is unanimous with primary winding (2), adopts star or delta connection to establishing ties with secondary building -out capacitor (5), making its and the elementary magnetic coupling resonant condition of being in, its resonant frequency is the same with the resonant frequency of primary winding (2), so that primary winding (2) reach magnetic coupling resonance with secondary (4). The utility model discloses be applied to aspects such as linear electric motor, because the heavy current that resonant coupling produced for the motor has advantages such as high thrust, big air gap, high efficiency.