A top-loading laundry treatment device comprising a box body, an outer drum disposed inside the box body, an inner drum pivotally disposed inside the outer drum, and a cover opening system, wherein the inner drum is provided with an inner drum cover that includes a first inner drum cover and a second inner drum cover; wherein the first inner drum cover and the second inner drum cover are opposite to each other and tightly locked to each other after being closed through a linkage mechanism; and wherein the cover opening system comprises a cover-opening lock which is disposed on the box body or the outer drum; wherein the cover-opening lock is provided with a cover-opening lock tongue, when the cover-opening lock tongue is extended, it can abut against a cover-opening button disposed on the first inner drum cover so that the inner drum cover is opened, characterized in that the cover-opening lock is further provided with a cover-opening positioning lock tongue and when the cover-opening positioning lock tongue is extended, it can abut against the inner drum cover, thereby further enabling the cover-opening lock tongue to abut against the cover-opening button; wherein a first stopper is disposed on the first inner drum cover and cooperates with the cover-opening lock to automatically open the first inner drum cover and the second inner drum cover when they are in a closed state, and the inner drum cover abuts against the cover-opening positioning lock tongue by means of the first stopper; wherein a drive motor is disposed in the box body, and the drive motor is drivingly connected with the inner drum for driving the inner drum to rotate to a position where the first stopper is aligned with the cover-opening positioning lock tongue; and wherein the cover opening system further comprises a controller, which is controllingly connected to the cover-opening lock and the drive motor respectively; and wherein the controller is configured for controlling the cover-opening lock to cause the cover-opening positioning lock tongue to extend, controlling the drive motor to drive the inner drum to rotate to the position where the first stopper is aligned with the cover-opening positioning lock tongue, and controlling the cover-opening lock to cause the cover-opening lock tongue to extend so that the inner drum cover is opened. wherein the inner drum is provided with an inner drum cover that includes a first inner drum cover and a second inner drum cover; wherein the first inner drum cover and the second inner drum cover are opposite to each other and tightly locked to each other after being closed through a linkage mechanism; and wherein the cover opening system comprises a cover-opening lock which is disposed on the box body or the outer drum; wherein the cover-opening lock is provided with a cover-opening lock tongue, when the cover-opening lock tongue is extended, it can abut against a cover-opening button disposed on the first inner drum cover so that the inner drum cover is opened, characterized in that the cover-opening lock is further provided with a cover-opening positioning lock tongue and when the cover-opening positioning lock tongue is extended, it can abut against the inner drum cover, thereby further enabling the cover-opening lock tongue to abut against the cover-opening button; wherein a first stopper is disposed on the first inner drum cover and cooperates with the cover-opening lock to automatically open the first inner drum cover and the second inner drum cover when they are in a closed state, and the inner drum cover abuts against the cover-opening positioning lock tongue by means of the first stopper; wherein a drive motor is disposed in the box body, and the drive motor is drivingly connected with the inner drum for driving the inner drum to rotate to a position where the first stopper is aligned with the cover-opening positioning lock tongue; and wherein the cover opening system further comprises a controller, which is controllingly connected to the cover-opening lock and the drive motor respectively;