A control locking device of a transverse stop of a vehicle pedal frame is characterized in that a lock base is arranged on a connecting board provided with a vehicle pedal frame mechanism and transversely corresponding to a 'back-pull preventive handle' of a box step, a lock stud shaft lever is arranged in the lock base, one end of the lock stud shaft lever is in the shape of an exposed handle, and a locking connector or joint at the other end of the lock stud shaft lever is aligned with the 'pull-back preventive handle'. During locking, the 'pull-back preventive handle ' on the box step is exactly clamped at a bayonet of the connecting board after a falling point of the box step is landed, so that the box step cannot be lifted up, the locking joint at the other end of the transverse lock stud shaft lever is exactly jacked on the 'pull-back preventive handle' only by means of pushing the handle at one end of the transverse lock stud shaft lever, and at the moment, a stop pin is exactly clamped below a radial table, so that the lock stud shaft lever cannot be withdrawn, and a vehicle is locked. During unlocking, a user only needs to use a key to drive a lock cylinder control mechanism to drive the stop pin to be lifted away from lower side of the radial table of the lock stud shaft lever, the lock stud shaft lever automatically returns to the original position under the effect of a spring, consequentially, the 'pull-back preventive handle' is unlocked, the box step can be lifted up, and locking control of the vehicle is completed.