The invention relates to a highly anti-clogging buried pressure compensation drip irrigation irrigator. The irrigator comprises an inserted pressure compensation dropper adhered to the inner wall of a PE hose through hot melting. A narrow slit water outlet is formed in the PE hose; the inserted pressure compensation dropper comprises an upper cover piece, a lower shell and an elastic film; an upper cover piece cementing surface and an assembled clamping table are arranged on the front of the upper cover piece, and the back of the upper cover piece is a flat plane; a main flow channel and an effluent buffer chamber are formed in the upper cover piece cementing surface; a holed supporting boss is formed in the effluent buffer chamber; a supporting boss and a screening positioning table as well as a recessed area and a compensation chamber water sealing ring are arranged on the back of the upper cover piece; the compensation chamber water sealing ring and the elastic film form a compensation chamber; a compensation chamber water inlet, a limiting boss and an overflow tank are arranged on the compensation chamber; a gridded filter window and a dropper screening tank are arranged on the front of the lower shell, and a filter window water inlet and a lower shell cementing surface are formed in the back of the lower shell; a suck-back prevention water sealing ring and a film mounting tank for mounting the elastic film are arranged on the filter window water inlet; and a mounting positioning table and an assembling fastener are arranged on the back of the lower shell. The irrigator disclosed by the invention is excellent in pressure compensation and anti-clogging effects.