  Hadron calorimeter (HCAL) is an essential sub-detector of the baseline
detector system for Circular Electron Positron Collider (CEPC). We plan to
build an Analog Hadron CALorimeter (AHCAL) prototype based on the Particle Flow
Algorithm (PFA). The AHCAL of CEPC uses steel as absorber and scintillator
tiles read out by Silicon Photo-Multipliers (SiPMs) as sensitive medium. The
energy linearity and resolution of the calorimeter depends on the light yield
uniformity of sensitive medium. It is essential to qualify the entire detector
production in order to select scintillator tiles with light yield uniform
within 10\%. An automated batch test platform has been designed with 144
channels, an automated 3D servo motor. The paper summarizes the tests performed
on more than 15000 scintillator tiles. The measured light yield, corrected for
the set-up response non-uniformity, is around 12.9 p.e. . About 91.6\% of
scintillators (14219 pieces) are qualified within 10\% of light yield window.
