Double-wall pipe fixing device

The utility model discloses a double-wall pipe fixing device which comprises a clamping ring combination body, a plurality of inner clamping ring adjusting sets and a plurality of outer ring adjusting sets, an inner clamping ring of the clamping ring combination body wraps an inner pipe of a double-wall pipe, an S-shaped outer clamping ring of the clamping ring combination body is embedded into an outer pipe of the double-wall pipe, and arc-shaped rubber gaskets wrap and are fixed to the upper end and the lower end of the S-shaped outer clamping ring. One end of the inner clamping ring adjusting set abuts against the outer circle face of the inner pipe of the double-wall pipe, and the middle of the inner clamping ring adjusting set is fixed to the inner clamping ring. One end of the outer ring adjusting set penetrates through the S-shaped outer clamping ring and then abuts against the inner circle of the outer pipe of the double-wall pipe, and the other end of the outer ring adjusting set is fixed to the oute