A 1.2 GeV electron booster synchrotron has been operated for nuclear physics experiment since 1997 at Electron Light Science Centre, Tohoku University, in which the high energy gamma-rays via Bremsstrahlung has been supplied for hadron physics. After the Great East Japan Earthquake in March 2011, recovery and reconstruction work of the accelerator complex is in progress. While a compact 90 MeV linac is newly constructed as a dedicated injector for the booster, old power supplies for synchrotron magnets and also pulsed magnets for beam injection are replaced. Furthermore some quadrupole magnets are replaced to the combined function ones containing sextupole component to correct the chromaticity. The power supplies and the combined magnets had been manufactured and those installations were completed. Current status of the booster upgrade is presented.