A top load drum washing machine and a positioning device thereof, which relate to the field of laundry washing equipment and which aim to solve the problems in the existing technology wherein a belt is easily worn out by the edge of a groove, which is located on a pulley and which corresponds to a latch bolt of a drum locking device, and wherein the positional arrangement of the locking device is not flexible enough. For this purpose, the positioning device for use with a top load drum washing machine comprises: a locking position which is provided on a spoke (21) of a pulley (2); a locking device (1) which is provided on an outer cylinder, the locking device (1) being provided with a latch bolt (12); the position of the locking device (1) corresponds to the rotational path of the locking position such that the latch bolt (12) may form a locking fit with the locking position when a drum stops rotating. By means of said structure, the present solution may prevent a belt on the pulley (2) from contacting a port
