In order to explore the co-pyrolysis treatment process of mixing steel rolling oil sludge and biomass, a thermogravimetric analyzer is used to pyrolyze steel rolling oil sludge and biomass (com stalk and straw stalk) separately under N₂ atmosphere, and some experiments are carried out by mixing three kinds of steel rolling oil sludge and biomass with different mixing ratios, and the synergistic pyrolysis characteristics of the above mixtures are discussed. At the same time, under different heating rate (β) conditions, the dynamic analysis of the hybrid pyrolysis process is carried out by the Friedman-Reich-Levi method, and the dynamic parameters are obtained. The results show that the pyrolysis of steel rolling oil sludge is mainly composed of 3 main stages: dehydration, oil decomposition and iron oxide reduction, and the main weight loss stage of biomass pyrolysis is de-volatilization. The synergetic effect of co-pyrolysis of corn stalk, straw stalk and steel rolling oil sludge is related to the type and mixing ratio of biomass, and the promotion effect is more obvious when the biomass mixing ratio is up to 70%, while the promotion effect of straw stalk on steel rolling oil sludge is better than that of corn stalk. The activation energy of co-pyrolysis between the two kinds of biomass and steel rolling oil sludge has a tendency to increase first and then decrease with the increase of conversion rate, when the conversion rate is 0.6 or 0.7, the maximum activation energy is 52.45 ~ 80.02 kJ/mol.