A hand-held package box and a developed plate thereof are provided. The package box includes a box body, a first plate, a second plate and a third plate. The third plate is connected to the box body, and the second plate connects the first plate and the third plate. The first plate has a first folded sheet, and the second plate has a second folded sheet. A position of the first folded sheet and a position of the second folded sheet are symmetrical with respect to a folding line between the first plate and the second plate. When the first plate is folded to a position between the second plate and the third plate, a folding line of the first folded sheet corresponds to a folding line of the second folded sheet, so that the first folded sheet and the second folded sheet, after being folded, form a handle.