A self-destroying disposable syringe includes a barrel which includes a hub disposed on the front end of the barrel, a flange is disposed on the inner wall of the hub a needle base which connects to the hub of the barrel, and includes a connecting portion, a containing portion disposed on the outer side of the connecting portion, and a self-destroying ring disposed on the back end of the needle base and connected to the connecting portion through one or more ribs when the needle base has connected to the barrel, the connecting portion and the self-destroying ring are located in the inside of the hub of the barrel, and the self-destroying ring matches the flange each other a plunger which is movably inserted into the barrel and includes a bar body, a pushing stem connected to the back end of the bar body, a pushing dish connected to the front end of the bar body, a cone with one end fixed to the pushing disc, and a puncturing portion fixed to the other end of the cone and a piston which is connected to the cone of the plunger, a cavity is provided within the piston a sealed front wall is provided on the front end of the piston, an opening communicated with the cavity is provided on the back end of the piston.
