Mesoporous ZSM-5zeolite was synthesized by a two-step process using industrial waste silica fume as raw material and starch as template agent. The crystalline shape, morphology, pore structure and acidic characteristics of the catalyst were characterized by XRD, SEM, N2 adsorption and desorption as well as NH3-TPD. It is found that the relative crystallinity of the synthesized molecular sieve is 73.4%, and the microscopic morphology is a columnar grain with a long axis of about 3 μm, which has a pore size distribution between 3 ~ 5 nm and a total acid content of 1.15 mmol/g. The catalysts were further used for the co-cracking of low density polyethylene (LDPE) and lignin (AL). The results show that when co-cracking LDPE and AL (1:1 mass ratio), the BTEX selectivity is 91.86%, which is higher than that of CZ (86.31%), and also higher than that of caracking LDPE and AL alone. Moreover, the BTEX yield obtained during co-cracking (22.94%) was also significantly higher than the theoretical yield of BTEX (19.79%), indicating a synergistic effect between the two feedstocks in the catalytic co-cracking process to improve BTEX production.