In this study, the pressure drops and mass transfer performance of a improved tridimensional rotational flow sieve tray (TRST) manufactured by 3D printing under the condition of gas–liquid concurrent flow were investigated experimentally. Results suggest that the pressure drops of the improved TRST are much lower than that of the original TRST due to the transition of the arc surface of the blades is smoother. Dry pressure drop of the TRST is within 12 Pa, and wet pressure drop is within 80 Pa. A volumetric overall mass transfer coefficient of the tray section was proposed, which increased first and then decreased with increased superficial flow factor and concentrations of NaOH solution, increased with the increasing spray density and decreased with the increasing partial pressure of CO2. For tray geometric parameters, the influence of blade numbers is strongest, twist angle of the blades is weakest, and tray heights and sieve hole diameters are the middling. We also designed an energy efficiency factor to reasonably evaluate the comprehensive performance of TRST. Through comparative analysis, TRST with 8 blades, a 60° or 90° twist angle of the blades, a tray height of 15 mm, and sieve holes of 2 mm diameter were found to has the optimal geometry.