A kinetic model was developed to represent the catalytic cracking of heavy oil from waste plastics by rare-earth metal exchanged Y-type (REY) zeolite to produce gasoline. The influences of reaction conditions on the product distributions were previously reported by us. On the basis of these results, a reaction pathway was proposed and a set of differential equations was developed, The kinetic parameters were determined by nonlinear least-squares regression of the experimental data. These parameters were found to be proportional to the amount of strong acid sites of the used catalysts. The calculated values of the product distribution were found to be in good agreement with the experimental data.