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To achieve a better mixing effect for the gas-liquid metal two-phase fluids and obtain higher velocity of liquid metal in the liquid metal magnetohydrodynamic (LMMHD) generator for improving its power output and power generation efficiency, a double-nozzle venturi mixer was proposed and the impact of mixer key dimensions, applied magnetic field and load factor on the mixing characteristics and power generation performance were investigated by adopting the VOF (volume of fluid) method in this paper. The results show that the velocity of liquid metal is greatly increased by the high-pressure gas in the mixer and the two-phase churn flow regime with lower two-phase slip ratio and higher uniformity, which represents a better mixing effect, can be found in the mixer with the smaller ratio of nozzle area to gas inlet area (<em>S</em>n/<em>S</em>g) and the larger ratio of mixing chamber area to total inlet area (<em>S</em>m/<em>S</em>i). In the range of this study, the output current, output power, and power generation efficiency of the LMMHD generator reach the maximum as the <em>S</em>n/<em>S</em>g = 0.040 and <em>S</em>m/<em>S</em>i =0.144. The increase of magnetic field not only ascents the volume fraction of liquid metal in the power generation channel, but also upgrades the two-phase uniformity, which are beneficial to improve the output power <em>P</em>wo and power generation efficiency <em>η</em>. However, the bigger magnetic field also leads to the ascension of two-phase slip ratio that makes the power generation performance be deteriorated. Besides, <em>P</em>wo and <em>η </em>elevates with the augmentation of the load factor<em> K</em> while <em>B</em>0 = 0.5 T.