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The thermal characteristics of bio-oils derived from swine manure/crude glycerol co-liquefaction were studied by thermogravimetric analysis. Thermogravimetric analysis of the bio-oils were carried out in O2 and N2 atmospheres under 20 C/min to a maximum temperature of 1000 C. The results indicate that the combustion processes of bio-oils were divided into three stages, with most of the materials decomposing between 330 and 370 C. The kinetic parameters of different kinds of bio-oils were determined using the Coats-Redfern method, considering that bio-oil combustion occurs in three consecutive steps. Four models including more than twelve alpha functions were tested to fit our experimental results. The calculation shows that the diffusion models are the best fit for describing the bio-oil combustion process in the air. The study not only provides useful data on burning this type of oil, but also provides information for designing and controlling a thermal degradation process.