A single-row valve tower of a high-voltage DC transmission converter valve comprises horizontally-arranged top and bottom shielding covers (1) and (6), and a converter valve arranged between the top shielding cover (1) and the bottom shielding cover (6). The converter valve is connected with the top shielding cover (1) and the bottom shielding cover (6) through suspension insulators (12). The converter valve is formed in such a manner that converter valve modules (3), which form an angle of inclination with respect to a horizontal direction, are orderly connected in series in a vertical direction in the form of a zigzag rule. Having a more compact overall structure and a more reasonable layout, the high-voltage DC transmission converter valve single-row valve tower well solves the problem of high-frequency oscillation resulting from insulation of a cooling water path and connecting busbar inductance, reduces the operational risk, and conforms to the design requirements of (ultra) high-voltage DC transmission converter valves with higher voltage and current levels.