The invention relates to a mixed reinforcement U-shaped concrete sheet pile, which has a U-shaped cross section, and comprises a bottom section, a first connecting section, a first connecting reinforcing section, a first connecting part, a second connecting section, a second connecting reinforcing section and a second connecting part; the two ends of the bottom section are separately connected to the first connecting section and the second connecting section; the first connecting section, the first connecting reinforcing section and the first connecting part are connected in sequence; the second connecting section, the second connecting reinforcing section and the second connecting part are connected in sequence; the first connecting part comprises a first connecting region; a second connecting region is arranged at the part, corresponding to the first connecting region, of the second connecting part, and when two mixed reinforcement U-shaped concrete sheet piles abut against each other, the first connecting part of one mixed reinforcement U-shaped concrete sheet pile is connected to the second connecting part of the other mixed reinforcement U-shaped concrete sheet pile, and the corresponding first connecting region and the corresponding second connecting region are connected. The mixed reinforcement U-shaped concrete sheet pile is high in soil blocking capacity and safe and reliable in structure.