The invention discloses an arch bar foundation the foundation plate of which comprises a plurality of arch bars with arch sections. As the arch bar shape of the arch bar foundation of the invention has better structural stiffness and better stability than the plate shape of the traditional foundation, capabilities of horizontal force resistance, slippage resistance, differential settlement reduction and the like of the foundation are improved. The invention also provides a construction method of the arch bar foundation, comprising the following steps: 1) leveling the land; 2) producing arch groves; 3) casting and pounding a cushion coat; 4) arranging an arch bar moulding board; 5) arranging a foundation beam moulding board; 6) binding the arch bar and foundation beam steel; 7) casting andpounding arch bar concrete; and 8) casting and pounding foundation beam concrete.