A quick-releasing mechanism belongs to the technical field of special apparatuses used for emergency relief materials delivery and comprises a couple of hook base plates mutually connected through a sling shaft, a clamp-pin hook shaft and a limit clamp shaft; a couple of guide plates formed with a releasing hook cavity are arranged on any one of the couple of hook base plates; a clamp-pin hook isadopted and one end of the clamp-pin hook is sleeved onto the clamp-pin hook shaft and the other end is free; a torsion spring is sleeved on the clamp-pin hook shaft and the middle part of the torsion spring is forced onto the clamp-pin hook and a couple of torsion spring feet are supported by the couple of hook base plates; a limit clamp is adopted and one end of the limit clamp is sleeved onto the limit clamp shaft and the other end corresponds to and is connected with the clamp-pin hook; and a releasing hook is arranged in the releasing hook cavity formed between the couple of guide platesand is connected with the limit clamp. The quick-releasing mechanism has the advantages that the safety can be guaranteed; the mechanism can be applied to both water and land areas so as to break theenvironment limit; and the integral structure is simple.