The invention discloses a car stopping mechanism of a rotary parking frame. The car stopping mechanism comprises a crankshaft (1), the middle part of which is hinged with the rotary parking frame (9) through a first pin shaft (5); the lower end of the crankshaft (1) is hinged with a first connecting rod (2); the other end of the connecting rod (2) is hinged with a first crank (4) through a second pin shaft (10); the first crank (4) below the second pin shaft (10) is hinged with the rotary parking frame (9) through a third pin shaft (8); the first crank (4) below the third pin shaft (8) is hinged with the second connecting rod (3); the other end of the second connecting rod (3) is hinged with a second crank (6) through a fourth pin shaft (11); and the second crank (6) below a fourth pin shaft (11) is hinged with the rotary parking frame (9) through a fifth pin shaft. The car stopping mechanism of the rotary parking frame disclosed by the invention can be used for effectively preventing a car from moving forward or backward on the rotary parking frame, thereby improving working safety of the rotary parking frame.