For a long time, people have tried a variety of methods to capture wind energy, and out of these, one of the most promising devices is the vertical-axis wind turbine (VAWT), in particular, the Darrieus turbine. A lot of research has been done to improve the Darrieus vertical-axis turbine's performance, and focusing on the same, the current study presents a pitch angle control mechanism of turbine blades having NACA 6-series profiles, which is called the variable-pitch mechanism. For this variable-pitch vertical-axis turbine, a 2-D computational work has been done with two NACA 6-series blades, i.e., NACA 64,221 and NACA 66,021, to see the impact on VAWT performance. The study's goal is to evaluate the two distinct 6-series profiles in terms of the turbine’s torque coefficient and power coefficient. These two profiles differ by their maximum blade thickness position, which is represented as a proportion of the chord line of the airfoil. The numerical simulations are carried out by using the unsteady Reynolds-averaged Navier–Stokes (URANS) equation and SST k–ω turbulence model. The findings show that employing NACA 64,221 over NACA 66,021 leads to a power coefficient improvement of 64% for the optimal tip speed ratio (TSR). Moreover, variable-pitch turbines with 6-series cambered blade profiles are able to produce more torque for all tip speed ratios compared to 6-series symmetric blade profiles.