The decline in fossil fuel sources has prompted research into finding renewable fuels. Alternative energy sources that have high efficiency and environmentally friendly are producing liquid oil from palm oil empty fruit bunches (EFB) and coal. Pre-treatment of empty fruit bunches using NaOH and variations of concentrations of H2O2, variations of the ratio of EFB/coal, the ratio of CaO catalyst, chemical and physical characteristics were studied to produce the better liquid oil yield. The H2O2 concentration is 0%; 1%; 2%; 3%, the ratio of EFB/coal (R) is 0/100; 25/75; 50/50; 75/25, the ratio of catalyst CaO/raw material is 0%; 3%; 6%; 9%, and running at 400°C with 100 mL/minute nitrogen gas flowing during one hour. The results showed that the addition of sodium hydroxide and hydrogen peroxide in the EFB pretreatment will increase the yield of liquid oil. With an increase in the EFB/coal ratio, the yield of liquid oil increases. Catalytic co-pyrolysis of EFB and coal using calcium oxide catalysts could improve the quality of liquid oil products.