A front-loading washing machine having a rotatable observation windowed door (3) comprises a washing machine housing front plate (1) provided with a laundry loading opening (2). The laundry loading opening (2) is provided with an observation windowed door (3). A hinge device is disposed between the observation windowed door (3) and the housing front plate (1), such that the observation windowed door (3) can rotatably open via the hinge device in a horizontal or vertical direction. By dispos - ing the hinge device at the front plate (1), the observation windowed door opens in a horizontal direction by a small extent and then rotates upward, thus facilitating laundry loading and unloading for a user, and also reducing required space in front of the washing machine when in use. Therefore, when the observation windowed door (3) is open, the space in the front does not need to be large, and only a half of the distance for opening a prior art door is required, thus enabling the occupied space to be small; in addition, automatic opening and closing of the door is realized.