Provided are an electronic device, a switch mechanism and a cover opening method of a machine shell. The electronic device comprises a shell base, a shell cover and the switch mechanism which comprises a driving module. The shell base is provided with an abutting part provided with a limiting opening groove. The shell cover is provided with an inner surface, an outer surface and a penetrating hole corresponding to the limiting opening groove. The driving module is provided with an operation piece, a fixing shaft and a driving shaft. The operation piece is provided with a pulling part placed on the outer surface and a pair of supporting parts. The fixing shaft is arranged on the supporting parts in a penetrating mode and is placed at the penetrating hole, and the two ends of the fixing shaft are arranged on the two end portions of the shell cover in a rotatable mode. The driving shaft and the fixing shaft are arranged on the supporting parts at intervals, and part of the driving shaft and part of the fixing shaft are placed in the limiting opening groove. The pulling part can rotate in a pivoting mode between a closed position abutting against the shell cover and an opened position far from the shell cover with the fixing shaft as the axis, and the driving shaft is in linkage with the pulling part, rotates in a pivoting mode with the fixing shaft as the axis and can move up and down in the limiting opening groove. The pulling part is in linkage with the driving shaft and abuts against the abutting part, so that the fixing shaft drives the shell cover to move backwards in the same direction to open the shell cover. According to the electronic device, the switch mechanism and the cover opening method of the machine shell, single-hand operation can be achieved.