The utility model discloses a flexible direct current is valve room air conditioner tuber pipe installation base back -to -back. It includes tuber pipe base member, U type bolt, installation fixed plate, the installation fixed plate weld in tuber pipe base member both ends, have with the supporting bolt hole of U type bolt set up in on the tuber pipe base member, have semicircle hole that the internal diameter is the same with rack lower chord external diameter set up in installation fixed plate lower extreme middle part, the internal diameter of U type bolt circular arc is with adjacent two the rack lower chord external diameter of rack lower chord connected node department is the same, the installation fixed plate passes through U type bolt fastening is in connected node department the rack lower chord, the installation fixed plate is for taking arc open -ended rectangle. It has been overcome, and present installation base is arranged in the middle of the last quarter member, the atress performance is poor, the cost is high, arrange single shortcoming, having and dismantling, to arrange nimble, fixed firm, the atress is functional, and the cost is cheap relatively, the advantage of the construction installation of being convenient for.