The invention belongs to the technical field of suction cups, in particular to a suction cup based on threaded cooperation. The suction cup comprises a suction cup body, a shell, a friction wheel, a first telescopic rod, a conical tooth combination, a first gear, a second gear, a third shaft and the like, wherein in the process that the suction cup body slides downwards along the wall face under the effect of a heavy object, after the friction wheel rotates and conducts a series of conveying, a stirring wheel can stir a rack through a stirring sheet to move upwards, then the rack no longer limits the third gear, and the heavy object can drop under the effect of the gravity; in the process that the heavy object drops, a steel wire rope is released, then a second scroll spring is compressed,the more the steel wire rope is released, the harder the second scroll spring is compressed, also the larger the force for the steel wire rope to pull the heavy object is until the tension is largerthan the gravity, and the dropping speed of the heavy object gradually becomes high until the heavy object stops dropping. Physical damage caused when the heavy object continuously drops to the groundat high speed is avoided, and the integrity of the heavy object is protected.