The present invention relates to the field of laundry washing equipment, and provided thereby are a positioning device and a washing machine comprising the positioning device. The positioning device comprises a locking module (1), the locking module (1) comprising: a lock body (11), a lock latch (12) and a friction member (13), wherein one end of the lock latch (12) is fixed within the lock body (11), and the lock latch (12) may slide with respect to the lock body (11) along the length direction, and the friction member (13) is provided at the other end of the lock latch (12); when the lock latch (12) protrudes from the lock body (11), the friction member (13) may push to tighten a pulley (2) fixed coaxially with a drum, thereby locking the drum. The positioning device aims to solve the problem wherein the locking latch of an existing top-load drum washing machine cannot be inserted into the groove of the pulley when positioning is inaccurate, thereby preventing the drum from being accurately locked. By means
