The invention relates to the field of aeroengine test, especially relates to low-cycle fatigue life test of the disc heart hole of a transmission arm-bearing rotor disc of an aeroengine, provides a manufacturing method of a test piece, and especially relates to a manufacturing method of a wheel disc heart hole fatigue test piece and a test piece of transmission arm-bearing aeroengine rotor multistage wheel disc heart hole fatigue test. The method allows multistage wheel discs to undergo combined test in order to simulate real installation use conditions, so untimely crack failure of transmission arm cotter holes in the test is avoided, thereby the life of the wheel disc heart hole is fully examined and verified.