The present invention relates to installation and extraction device a doctor blade (21) in a screen printing cylinder mounted on a printing machine. The apparatus allows comprising a fixed support in the machine frame (1) in extension of the cylinder (2), orbital path (3) is pivotally moved about the axis parallel to the axis of the cylinder It is attached to the support (2) so as to. Orbital path (3), the slider (9) is configured to make it possible to move only parallel to said axis. The slider (9), in order to allow that the doctor blade (21) is removed quickly fixed or from which the slider (9), and means fitting provided on the doctor blade (21) (14, 15) It is equipped with a quick assembly and disassembly means (10, 13) that interact. The slider (9), which appeared to remove the doctor blade (21) in a first limit position located outside the cylinder, the front operating position of the doctor blade (21) in a second limit position of the cylinder It is configured to allow it to be disposed. In this position, the doctor blade (21) by rotating the orbital path (3) is removed or from which is installed in operative position.