The invention relates to a cut-guide type ecological drainage ditch. A drainage ditch (10) is dug in an area where underground water undercurrent is relatively developed, and a pebble layer (4) and geotextile (7) are laid at the bottom of the drainage ditch (10); one side of a first side slope (11) is protected and built by adopting a concrete filter plate (6), the other side of a second side slope (12) is protected and built by adopting a concrete plate (9), and slope feet of the first side slope (11) and the second side slope (12) are provided with concrete tooth walls (8); and a permeable grass planting brick (2) is laid on one side of the top of the first side slope (11) of the drainage ditch (10), and planting grass (1) is carried out, a medium coarse sand cushion layer (3) and a pebble cushion layer (4) are paved under the bricks of the permeable grass planting bricks (2), two layers of plastic blind pipes (5) are laid under the pebble cushion layer (4), the plastic blind pipes (5) are wrapped with geotextile, the plastic blind pipes (5) are laid in the direction vertical to the drainage ditch (10) and is inclined to one side of the drainage ditch. The invention can efficiently and quickly discharge rain, flood and underground water into a river channel.