A cover opening structure comprising: a case; a cover having at least one first portion, a second portion and a connecting portion connected to the first portion and the second portion, the first portion having a first side and the second portion having a second side, wherein the second side is connected to the case; a pushing button disposed on the case and suitable for moving horizontally relative to the case, wherein the pushing button has a body and an inserting portion extended from the body; the cover opening structure characterized in that it further comprises: a pushing unit having a first end, a second end and a leaning portion connected between the first end and the second end, and the inserting portion located between the body and the first end; and an axle disposed in the case, the leaning portion leaning against the axle, and the inserting portion enabling the pushing unit to rotate about the axle while the first end moves downward and the second end moves upward when the pushing button is moved, so as to push up the first portion of the cover, wherein the connecting portion is softer than the first portion and the second portion such that when the cover is opened, the connecting portion may cause an angle variation between the first portion and the second portion so that the cover may be folded into a supporting mode. a case; a cover having at least one first portion, a second portion and a connecting portion connected to the first portion and the second portion, the first portion having a first side and the second portion having a second side, wherein the second side is connected to the case; a pushing button disposed on the case and suitable for moving horizontally relative to the case, wherein the pushing button has a body and an inserting portion extended from the body; the cover opening structure characterized in that it further comprises: a pushing unit having a first end, a second end and a leaning portion connected between the first end and the second end, and the inserting portion located between the body and the first end; and an axle disposed in the case, the leaning portion leaning against the axle, and the inserting portion enabling the pushing unit to rotate about the axle while the first end moves downward and the second end moves upward when the pushing button is moved, so as to push up the first portion of the cover, wherein the connecting portion is softer than the first portion and the second portion such that when the cover is opened, the connecting portion may cause an angle variation between the first portion and the second portion so that the cover may be folded into a supporting mode. a pushing unit having a first end, a second end and a leaning portion connected between the first end and the second end, and the inserting portion located between the body and the first end; and an axle disposed in the case, the leaning portion leaning against the axle, and the inserting portion enabling the pushing unit to rotate about the axle while the first end moves downward and the second end moves upward when the pushing button is moved, so as to push up the first portion of the cover, wherein the connecting portion is softer than the first portion and the second portion such that when the cover is opened, the connecting portion may cause an angle variation between the first portion and the second portion so that the cover may be folded into a supporting mode.