The invention discloses an underground oscillating injection distribution technique pipe string for a water injection well and an underground oscillating injection distribution method for the water injection well. The pipe string comprises an oscillating buffer and an oscillation-generating water distributor, wherein the upper end of the oscillating buffer is in threaded connection with an upper oil tube, and the lower end of the oscillating buffer is in threaded connection with an adapter connector, and is fixed by an anti-loosening pin; and the upper end of the oscillation-generating water distributor is connected with the adapter connector through a short joint, and the lower end of the oscillation-generating water distributor is connected with a lower oil tube through coupling. According to the underground oscillating injection distribution technique pipe string disclosed by the invention, a water injecting technology and a blockage-removing technology are integrated, and energy of injected water is utilized to form hydraulic oscillation pulses underground through the oscillation-generating water distributor, so that blockage of stratum nearby a well wall and stratum further from the well wall can be effectively relieved and prevented, and therefore, the purposes of testing and regulating as well as augmenting injection can be simultaneously realized, single-well cost is reduced, operation time is effectively reduced, and a water well valid period is prolonged.