The invention provides a sightseeing cabin of a tourist vehicle. The sightseeing cabin comprises a sightseeing cabin body, a sightseeing cabin floor, seats, rotary supports and a sightseeing cabin self-balance mechanism. The sightseeing cabin self-balance mechanism comprises a motor, a worm gear and worm speed
reducer, a
coupling, pinions, bearing blocks, a transmission shaft, chain wheels and an
electromagnetic clutch; the motor is fixed onto the sightseeing cabin floor of the sightseeing cabin; the motor is coaxially connected with the worm gear and worm speed
reducer; an output shaft of the worm gear and worm speed
reducer is coaxially connected with the
coupling, the bearing block c, the
electromagnetic clutch, the bearing block b and the small chain wheel; the large chain wheel is connected with the small chain wheel by duplex chain wheels; the sightseeing cabin is mounted outside a tourist vehicle wheel
flange. The sightseeing cabin has the advantages of high passenger capacity, smoothness in rotation, riding comfort, wide vision and passenger safety. Besides, the
electromagnetic clutch can be separated when equipment is powered off, accordingly, the levelness of the floor can be maintained by counterweights and the gravity of the sightseeing cabin, and rescue can be facilitated.