PURPOSE: A gutter for building a garden is provided to install a gutter in a longitudinal direction on a road formed in a residential site, fill it with soil, cultivate desired plants, and manage it. CONSTITUTION: A gutter for building a garden comprises the following steps: A gutter (10) is formed as a ditch form whose upper part is opened. Multiple supporters (14) are installed between a road side wall (11) and a sidewalk wall (12) with an interval, which prevents the road side wall and the sidewalk wall from being constricted inside. An opening part (15) discharges water to the lower side on the bottom between the road side wall and the sidewalk wall, and roots the plants to the lower side. A reinforcing support (17) is installed in front of the road side wall. An upper cover part is horizontally installed in the upper part of the road side wall. An upper hitch portion (13a) hitched in the upper part of a sidewalk block (28) installed on the sidewalk is horizontally formed in the upper part of the sidewalk wall. The reinforcing support is put on a reinforcing support supporter (18), the reinforcing support supporter is horizontally formed in the lower middle part of the outer side of the road side wall. A falling prevention part (19) preventing the gutter from falling down to the road side is horizontally formed in the lower middle part of the outer side of the road side wall. Sidewalk blocks (28) are installed on the sidewalk and put on a sidewalk block supporter. The sidewalk block supporter is installed as protruded horizontally to the outside in the upper middle part of the outer side of the sidewalk wall. Pipe asphalt (27) forms a drain hole which is placed in the upper part of the gutter supplies water into the gutter. A side hole (26) is formed outside of the road in the residential site which is covered with the pipe asphalt. A groove for installing the gutter is formed between the sidewalk block and a curb (29) after installing the curb on the sidewalk s
