A cartridge loading mechanism of a toy revolver includes a magazine, a cylinder, a cartridge drum and a driving element. When loading bullets, the cartridge loading mechanism may be removed to load the bullets. When firing a bullet, the cylinder may be rotated to provide a high simulation. When a bullet is fired, the cylinder and the cartridge drum are rotated altogether, and the magazine disposed in the cylinder and an inner magazine tube remain still and will not rotate with the cylinder, and the inner magazine tube is aligned precisely with the barrel to improve the shooting accuracy.