A drip irrigator for potted plants comprises a support base (1) with at least three feet (3) insertable in the ground； a vertically extending body (15) extending downwards from said base (1) between said at least three feet (3) and is provided with an irrigation water containing chamber (16) which is provided with an upper wall (21) crossed by a filling orifice (20) and with a lower water outlet opening (22). Means (9, 12, 13) for removably superimposing and fixing a water container (10) on said chamber (16) are provided. A float (17) is accommodated in said chamber and provided at the top with a shutter pin (19) engageable with said orifice (20) and disengageable therefrom according to the level of water in said chamber (16). A dripping device (24) is removably inserted into said opening (22) to allow the water to drip one drop at a time, and a substantially ogive-shaped delivery plug (27) is removably fixed at the lower end (26) of said vertically extending body (15). The delivery body (17) is provided with a terminal trap (28) for collecting the water falling from the dripping device (24) and with small lateral holes (29) for transferring the water collected in said trap (28).
