The invention discloses a fast refrigerating seat cushion. The fast refrigerating seat cushion comprises a seat cushion body. The seat cushion body is connected with a refrigerant storing tank used for storing a liquid-state refrigerant. A connecting pipeline is provided with a control valve. The seat cushion body is mainly composed of an upper layer and a lower layer. A sealed cavity is formed between the upper layer and the lower layer. A plurality of ventilating holes which communicate with the sealed cavity are formed in the upper layer. The refrigerant storing tank communicates with the sealed cavity. The liquid-state refrigerant flows into the sealed cavity by opening the control valve, absorbs heat to be gasified and volatilized from the ventilating holes, so that the seat cushion body can be fast cooled. By means of the fast refrigerating seat cushion, the surface temperature of the seat cushion can reach the temperature which makes a human body comfortable within a short time, fast cooling is achieved, the degree of satisfaction of a user is improved, the fast refrigerating seat cushion is simple in composition and structure, low in manufacturing cost and small in whole size, the fast refrigerating seat cushion can be commonly suitable for all kinds of transportation tools such as bicycles, electrombiles, motorbikes and automobiles, thefast refrigerating seat cushion is easy to achieve, the practicability is high, the range of application is wide, and the fast refrigerating seat cushion is suitable for being widely used and promoted.