The invention discloses a double-seal floating disc in the technical field of floating discs. The double-seal floating disc comprises a floating disc, wherein the floating disc is located in an 
oil storage tank, the top surface of the 
oil storage tank is provided with an air hole, an oil measuring hole and a 
light hole, the floating disc is provided with an inflation door, a cavity is formed in the floating disc, and air bags are arranged on the periphery of the floating disc, and the floating disc is provided with a pressure 
assembly, a positioning 
assembly and a static exporting 
assembly. Through the pressure assembly and the air bags, the floating disc is internally inflated through an inflation door, so that the air bags on the side face of the floating disc are expanded, holes in the floating disc and the side face of an 
oil storage tank are filled, primary sealing is conducted, a rotating 
handle is rotated, a rotating frame moves outwards along threads on a 
threaded pipe, an ejector rod is driven to move rightwards, and the ejector rod presses a pressure rod; a fixing block drives a sealing block and a sealing 
skin to be tightly attached to the inner side wall of the oil 
storage tank, the sealing 
skin and the sealing block form secondary sealing, the sealing effect of the device is enhanced through the secondary sealing, and the situation that the working effect of the device is affected due to sinking or collapsing of the floating disc caused by 
oil immersion or oil gas leakage and volatilization is avoided.