In order investigate the effects of different pyrolysis temperatures and catalysts on the pyrolysis products of polypropylene (PP), the gas and liquid products were characterized respectively. The results showed that the least amount of CO₂ and the highest content of combustible gases were produced at the high temperature pyrolysis of 700 °C. The H/C ratio was significantly improved to 1.77 with the in-situ catalytic pyrolysis of CaO (5 g), and more aromatic compounds were converted into aliphatic ones at this time. When C (5 g) and CaO (5 g) were used separately for ex-situ catalytic pyrolysis, the total amount of alkanes and alkenes obtained was the highest, making the liquid products more suitable as fuels. Moreover, PP pyrolysis at 700 °C can produce more combustible gases, which is beneficial for secondary utilization. When C and CaO are used as catalysts in the catalytic pyrolysis of PP, more high-quality pyrolysis liquid products can be produced.