We have developed novel 3D-stacked reconfigurable spin logic chip having ultrafast on-chip SPRAM to overcome drawbacks of conventional reconfigurable LSIs. Two reconfigurable spin logic chips were carefully designed and successfully stacked using 3D integration technology. From the SPRAM cell evaluation, the fastest write speed of 5 ns was obtained in the circuits. To realize higher performance reconfigurable LSIs, parallel reconfiguration was fully demonstrated for the stacked reconfigurable spin logic chips for the first time. Both ultrafast on-chip SPRAM and 3D-stacked structure will open a new era of reconfigurable LSIs.