The invention provides a torsion wrench. The torsion wrench comprises a body, a wrenching device, a torsion device, an adjusting device and an arithmetic device; the wrenching device is provided witha connecting rod and a tool head, the connecting rod is pivoted to the body, the connecting rod is provided with a pivoting end and an abutting end, the pivoting end is pivoted with the tool head, andthe connecting rod can be pivoted relative to the tool head to be positioned at a first position or a second position; when the connecting rod is located at the first position, the torsion wrench isprovided with a first force arm, when the connecting rod is located at the second position, the torsion wrench is provided with a second force arm, and the torsion device is arranged on the body and pushes against the abutting end; the adjusting device is movably arranged on the body and is connected to the torsion device so as to set an initial torsion value, the arithmetic device is arranged onthe body and comprises a measuring unit, an arithmetic unit and a display unit; and the measurement unit can measure the initial torsion value, the arithmetic unit is capable of multiplying the initial torsion value by a first correction coefficient or a second correction coefficient corresponding to the first force arm or the second force arm to obtain a corrected torsion value, and the display unit displays the corrected torsion value.