PURPOSE: A grating plate for retaining earth having a secure connection structure and a connection structure thereof are provided to enable easy planting in an earth surface by naturally sending surface water to the earth surface. CONSTITUTION: A grating plate(1) for retaining earth having a secure connection structure comprises coupling members(2) and concave parts. Each coupling member is composed of a protruded extension part and a vertical part. The protruded extension part is outward extended from the bottom of an outer wall(10). The vertical part is vertically extended from the outer end of the protruded extension part. The coupling members are protruded from the outer surfaces of the outer walls. The concave parts are formed on the outer surfaces of the outer walls.
