The invention relates to a submerged nozzle clamping device, which comprises two sets of clamping components arranged oppositely, wherein each set of the clamping components comprise a pedestal and a supporting slide bar which can rotate around a supporting shaft fixed on the pedestal, the clamping end of the supporting slide bar is clamped on the clamping surface of a submerged nozzle, the stress end opposite to the clamping end on the supporting slide bar is subjected to the downward pressure from a pressing mechanism fixed on the pedestal, the pressing mechanism comprises a flexible component and a gland which is arranged between the flexible component and the stress end of the supporting slide bar, a cylindrical protrusion is formed on the contact part of one of the gland and the supporting slide bar, the axial line of the cylindrical protrusion is parallel with the extending direction of the supporting shaft, and the lower end face of the gland is in line contact with the supporting slide bar through the cylindrical protrusion. The submerged nozzle clamping device has the advantages of durable spring pressure, difficult deformation, and long service life.