The invention belongs to the technical field of robots, and particularly relates to a symmetrical robot joint. The symmetrical robot joint comprises a base, a waist seat, a big arm, a three-axis assembly, a small arm, a wrist shaft assembly, and an end flange which are rotatably connected in sequence, wherein a five-axis driving mechanism and a six-axis driving mechanism are symmetrically arrangedin the small arm, the five-axis driving mechanism is connected with the wrist shaft assembly and used for driving the wrist shaft assembly to rotate around a fifth axis relative to the small arm, thesix-axis driving mechanism is connected with the end flange and used for driving the end flange to rotate around a sixth axis, and the sixth axis is perpendicular to the fifth axis. A precision speedreducer of the symmetrical robot joint is transferred from the six-axis axis position to the five-axis axis position, the hollow performance, the miniaturization and the flexibility of the six-axis are improved, and therefore, the transmission viscous resistance is small, the energy-saving and environment-friendly efficiency is high, the inertia is small, and the control difficulty is low.