In the preparation of high-softening point and high-melt viscosity meta-pentadiene petroleum resin, enriched meta-pentadiene material, which is obtained from separated C5 fraction as side product of cracking ethylene and has meta-pentadiene content of 65-80 wt%, in reaction solvent benzene, toluene or xylene is polymerized in the presence of catalyst aluminum trichloride to obtain the meta-pentadiene petroleum resin product. The polymerization is performed in a sealed reactor at 40-80 deg.c for 4-8 hr, and the reactant material is added into the reactor in homogeneous rate. The product has softening point over 110 deg.c and melt viscosity of 500 cps or up to 800 cps, and is especially suitable for some special applications, such as road mark paint used in tropical area and adhesive usedin high temperature environment.