Thermal and mechanistic behaviours of solid biofuel are essential for commercial exploitation. In this work, the suitability of torrefied EFB as a solid biofuel was evaluated by investigating its physicochemical characteristics, kinetics and reaction mechanism during pyrolysis. The pyrolysis behaviour of raw and torrefied EFB was predicted via thermogravimetric analysis, kinetic parameters via Coats-Redfern three pseudo-components model-fitting method and pyrolysis mechanism via Criado method with Z-master plot. The physicochemical properties of torrefied EFB improved significantly compared to raw EFB in terms of fuel properties such as carbon content (8%-41%), fixed carbon (79%-328%) and calorific value (7%-42%). The degradation rate of hemicellulose and cellulose of torrefied EFB increased when the torrefaction temperature increased from 225°C to 300°C, leading to lower char yield and overall activation energy to initiate the pyrolysis process. The model deduced that higher overall activation energy was exhibited by raw EFB (9.39 kJ/mol) than those of torrefied EFB ranging from 6.55-7.86 kJ/mol (300°C-225°C). Thermal degradation of hemicellulose from torrefied EFB dominated the process by about 74% compared to cellulose and lignin when torrefaction temperature increased from 225°C to 300°C. Torrefaction could convert the power law mechanism to nucleation and growth mechanism gradually, allowing for better EFB thermal decomposition as a whole.