The present invention relates to a watertight fence capable of coping with the inclination and bending of a road side boundary stake, in which blocks of a square bar shape are pinched between piles so as to be shifted in height from each other in accordance with an upper surface inclination of the boundary stones, The blocks are watertightly coupled to each other by the restoring force of the projections by inserting them into the grooves of adjacent blocks, and at the same time, a sealing member whose shape changes according to the surface curvature of the boundary block is attached to the lower end of the block, It is possible to prevent sewage or chemicals from splashing from the roadside to the flower beds or the sidewalk.
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