Full immersion liquid closed type oil tank inner floating disc

The utility model relates to a full-immersion closed type oil tank inner floating disc which comprises a floating disc body arranged in an oil tank, a plurality of supporting legs are arranged on the lower portion of the floating disc body, first sliding blocks are arranged on the upper portions of the peripheral side faces of the supporting legs, and supporting leg installation grooves allowing the supporting legs to be inserted therein are formed in the floating disc body. A first sliding groove allowing the first sliding block to slide up and down is formed in the side wall of the supporting leg mounting groove, a first clamping groove perpendicular to the first sliding groove is formed in the upper end of the first sliding groove, and the first sliding block can slide in the first clamping groove when the supporting leg rotates in the axial direction; annular reinforcing plates are arranged on the upper portions of the supporting legs, annular grooves matched with the annular reinforcing plates are formed