The semi automatic corner and side tape sealing machine GPB-56+GPG-50 is especially for the electronics and the industry that needs sea transportation, because the sealing effect can achieve dust, moisture, oxidation and acidity resistance. The machine can adjust manually the width and height to accommodate different sizes of cartons. And the 90° angle machine uses the cylinder to automatically push the box. Finally, the upper and lower corners and sides of the carton are automatically sealed at the same time. The sealing process is fast and stable, and the sealing effect is not wrinkled and can be combined with the GPA/GPB/GPC model to form the I-shape sealing.