F-F double-wall storage tank has the advantages of long service life, corrosion resistance, insulation, static conductivity, light weight, free maintenance, shock resistance, load bearing, etc. A 24-hour monitoring system can be installed in the inter-layer between the inner wall and the outer wall. No matter the inner wall or the outer wall leaks, the inter-layer can automatically sense and alarm, and repair can be carried out in time to avoid the pollution of groundwater and soil caused by oil leakage.