The invention relates to a device for injecting at least one substance and/or chemical preparation into trees and/or palm trees, characterized in that it includes: a) a receptacle (1), the inside of which includes a flexible container (2) suitable for holding the substance and/or chemical preparation; b) a connection element (3) suitable for inserting at least one of the ends thereof into the trunk of the tree or palm tree; c) an adapter system located at the receptacle outlet, which, in turn, includes a membrane holder (4), a non-return valve or membrane (5) and a closure element for the adapter system (6). The invention likewise relates to a process for applying at least one substance and/or chemical preparation to at least one tree and/or palm tree.
