The frameless balcony adopts a high security tempered glass, and the corresponding hardware is combined with a large-section aluminum alloy structure. Its design enables each window to move both left and right, and can also be arranged 90-by-block, and the entire balcony window can be According to the user's needs, it is fully open and can also be completely closed, fully retaining the features and functions that the balcony should have. It can be very effective in blocking wind and rain, blocking dust and noise, and a reasonable structure that enables the windows to open inwards. It is not necessary to open the window out of the body and it is safe and simple to clean. Because there is no vertical window frame, there is no obstruction to the line of sight when the window is closed, and the maximum light is penetrated into the room, which is close to nature, making the balcony a fully casual sun room.