In this research, high-density and high-strength carbonized carbon blocks were manufactured by coke sintering resulted from heat treatments of biomass pyrolysis tar. First, the molecular weight distribution of the tar was controlled through a pressurized heat treatment at 365°C and then this heat-treated tar was treated using a delayed coking system to obtain the self-sintering coke. Finally, carbon blocks were molded from the self-sintering coke and carbonized at 1100°C for 2h. Through rapid decomposition of the high molecular weight compounds in the tar at 360°C, the molecular weight distribution of tar was confirmed to be controllable by this treatment stage. During carbonization was observed a swelling in carbon blocks manufactured that contain more than 15 wt% of volatile matter from 150-500°C. The optimum conditions of the two heat treatments stage were established to be 310°C for 3 h and 500°C for 1.5 h. The highest density and highest strength of the carbonized carbon blocks manufactured were 1.44 g/cm3 and 68.7 MPa, respectively.