Diesel fuels obtained from waste tube-tyre (WTT) and waste polypropylene (WPP) were found using the base strontium carbonate (SrCO3) as a catalyst through a catalytic-pyrolysis cracking. Liquid hydrocarbons fuels were analyzed through GC-MS-MS, FT-IR, 1H and 13C NMR, ICP. Physicochemical properties of diesel fuel were analyzed through ASTM methods. Their results were found such as saturates, naphthenes, aromatics, monohydric alcohols, aldehydes, esters, amides, halides. Conversions of 95 gm, 90 gm, and 100 gm WPP plastics with 5 gm, 10 gm and 0 gm SrCO3 into diesel fuel were collected 92%, 89%, and 80%, light gases were 7.52%, 10.52%, and 19.45%, residues were 0.48%, 0.48%, and 0.55%. Research octane numbers (RON) of diesel fuel from WPP and WTT are 87.32 and 89.65. Conversions of 95 gm, 90 gm, and 100 gm WTT with 5 gm, 10 gm, and 0 gm SrCO3 into diesel fuel were collected 55%, 64%, and 48%, light gases were 15.55%, 11.64% and 15.56%, residues were 29.45%, 24.36%, and 36.44%. Bromine numbers of diesel fuel from WPP and WTT are 59.87% and 45.83%.