The utility model provides a self-sealing type quick hydraulic joint which comprises a connecting body, a shell sealing ring, an upper shell, a movable valve element pressing spring, a movable valve element, an ejection rod, a piston, a piston sealing ring, a union, a piston reset spring and a lower shell. The connecting body is in threaded connection with the upper shell; the upper shell and the lower shell are connected through the union; a reducing annular platform arranged in the middle of the lower shell is in threaded connection with the lower end of the ejection rod; the piston and the piston reset spring are arranged between the upper end and the annular platform of the lower shell; the movable valve element and the movable valve element pressing spring are arranged between the ejection rod and the connecting body. The self-sealing type quick hydraulic joint has the advantages that quick supply of hydraulic oil can be achieved through quick connection between a hydraulic pipeline and a hydraulic clamp; when the union is dismantled, the movable valve element can be closed quickly and automatically, and the hydraulic oil can be prevented from leaking to cause waste and polluting the construction environment.