A novel thermal sensitive catalyst was synthesized by the reflux method and then added into the low density polyethylene (LDPE) film, the thermocatalytic degradation of films was conducted in oven with near room temperature under darkness. The obtained samples were characterized with Scan electron microscope (SEM), Energy dispersive analysis of X-ray (EDX), Mechanical properties, Atomic force microscope (AFM), Thermogravimetry (TG), Gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FT-IR). Results showed that the composite film was thermally degraded obviously, while pure polyethylene film changed slightly. After thermodegradation for 45 days under 55oC, mechanical properties decreased obviously of composite film, roughness increased significantly and some fold and scaly structure appeared on the surface, thermal decomposition temperature of which reduced by 13oC, molecular weight also significantly dropped, besides, the characteristic absorption peaks such as carboxylic acid and hydroxy were observed as well.