High-power vehicle-used superflat hydraulic torque converter

The utility model relates to a high-power vehicle-used superflat hydraulic torque converter, which includes a cover wheel assembly, a turbine assembly, a pump impeller assembly, a guide wheel assembly, a torsion shock absorber and a one-way clutch, wherein the turbine outer ring consists of four arc sections; the radius ratio of the four arc sections from the outer side of the circulation circle to the inner side of the circulation circle is that W1: W2: W3: W4 equals to 1: 2.08: 7.64: 1.68; the pump impeller outer ring consists of three arc sections; and the radius ratio of the three arc sections from the outer side of the circulation circle to the inner side of the circulation circle is that B1: B2: B3 equals to 1: 2.89: 0.83. The high-power vehicle-used superflat hydraulic torque converter solves the technical problems that the conventional torque converter is heavy, big in size and limited in utilization, the width ratio of the circulation circle is reduced to 0.1875, the width of the circulation circle is changed into 67.5 mm, the axial size is reduced, the radial size is reduced, the transmission efficiency is improved, and the problem of space limitation brought by the developing multi-gear automatic gearbox of the modern truck is solved.