The present invention refers to a precision liquid dispensing device, in particular to a portable disposable device for controlled medication dispensing during certain time period, such as insulin for instance and similar, comprising a body with a container to accept liquid and a movable piston to press said liquid out of said container. It is provided for, according to the present invention, that cavity (6) is formed in a body (1) communicating at its first end via an aperture in a wall (3) of the body (1) with the surrounding. A movable piston (7) is arranged in said cavity (6) with the outline being complementary with the outline of the cavity (6). Said piston (7) is formed with a through-hole (8) extending approximately in parallel with the course of said cavity (6).
