The invention relates to an artificial fish reef construction method using sandy beach in estuary intertidal waters as foundation. The method comprises the steps of A) selecting moso bamboo being 5 to 6cm in diameter, and cutting into unified 2.2m sections to be used as a reef body, wherein the unified 1.7m length is treated as a sand feeding section; B) treating the rough end as the sand feeding end, and drilling a hole at every 20cm in the sand feeding section, wherein the holes are 0.5 to 0.8cm and can pass through bamboo bodies, the moso bamboo cannot be cracked due to hole drilling, and any cracked moso bamboo cannot be put into use; C) vertically impacting the sandy land through a water gun until forming a hole being 6 to 7cm in diameter and 1.6 to 1.8m in depth, immediately inserting the reef body into each hole from the sand feeding end, wherein san flows into the reef body through the hole and counteract the floating force together with the frictional force of the outside of the reef body; fixing the reef body on the beach; exposing 45 to 55cm reef body from the surface of the sandy land, an finishing the single fish reef after the sand reflows to fix the reef body; D) centrally fixing a plurality of reef bodies to form a reef array; the space of the adjacent reef bodies in the reef array is 2cm.