Abstract: The irrigation system for bonsais comprises a water tank, a pot inside of which a substrate for a bonsai is housed and irrigation means of the water in said tank to said substrate, characterized in that the system comprises a moisture detector arranged in said substrate, which detects the degree of moisture of the substrate and determines the activation of said irrigation means when the degree of moisture of the substrate is lower than a predetermined value. It allows for the irrigation and automatic and intelligent care specific to the cultivation of bonsais.