Enhancing product transport at the back end of the tool electrode can improve the machining performance of macro electrolyte jet machining (macro-EJM). In this paper, novel cathode tools with negative-incidence jet forms that are designed to enhance product transport at the back end of the tool electrode in order to improve machining performance during macro-EJM of TC4 titanium alloy were proposed. The effects of various jet angles on the flow field distribution were simulated numerically. Experiments were also performed to verify the accuracy of the simulation results. The simulation results showed that tools with negative-incidence jet forms can not only increase the high-velocity flow zone at the back end, but also reduce the low-velocity flow zone in the machining area compared to the tool with a vertical jet form. This can enhance product transport at the back end of the tool and improve surface quality. Experimental results also showed that the groove with relatively smooth silver surface can be obtained when the tool jet angle is −15°. Comparing to the tools with other jet angles, the groove machined using the tool with a jet angle of −15° can also acquire the maximum MRR, flat-bottomed-region width, machining depth and the minimum taper. In addition, rapid product transport can promote subsequent processing. The machining current, depth, and MRR produced during deep groove machining using the tool with a jet angle of −15° could be respectively 22 %, 20 %, and 17 % higher than those produced using a vertical jet form.