The invention discloses a conveniently assembled sealing gasket with a high sealing property. The sealing gasket comprises a gasket body, wherein a through hole is formed in the gasket body; mountingholes are formed in two sides of the through hole; a sealing block is arranged at the upper end of the side wall of the through hole; the sealing block comprises a #1 side plate and a #2 side plate; the #2 side plate is located on one side of the #1 side plate; a groove is formed between the #1 side plate and the #2 side plate; a #1 clamp plate and #2 clamp plate are arranged in the groove; the #2clamp plate is located below the #1 clamp plate; #1 clamping parts are arranged at the upper end of the side wall of the mounting hole; #2 clamping parts are arranged at the upper ends of the #1 clamping parts; and the plurality of #1 clamping parts and #2 clamping parts are arranged at the edge of the mounting hole in a spaced manner. The sealing gasket disclosed by the invention is simple in structure and convenient to use and mount, has the good sealing property and is easy to popularize and use.