Two self-interpenetrating metal-organic frameworks (MOFs) 1 and 2 were designed and constructed through the coordination self-assembly of transition metal nodes and a trigonal ligand. They both exhibit interesting three-dimensional constructions with the 1 + 2 self-locked mode. Because of the outstanding moisture susceptibility and luminescence property, MOF 1 has a potential detectability toward nitrofurantoin (NFT) in water. More importantly, MOF 1 can efficiently monitor NFT in bovine serum. Taking into account of Lewis basic sites in the skeleton, MOF 2 can be implemented as an outstanding heterogeneous catalyst for the Knoevenagel reaction. Furthermore, they both reveal excellent circularity and an application effect for five cycles.