Fabricated arched aqueduct support, aqueduct and construction method of aqueduct support

The invention provides an assembly type arched aqueduct support, an aqueduct and a construction method of the aqueduct support. The aqueduct support comprises a left buttress, a right buttress, a left arch rib, a right arch rib and a plurality of bent frame columns. A first support and a second support are respectively arranged at the tops of the left buttress and the right buttress; the left arch rib and the first support, the left arch rib and the right arch rib, and the right arch rib and the second support are fixedly connected through reinforced concrete structures. The framed bent columns comprise first framed bent columns, second framed bent columns and third framed bent columns, and the first framed bent columns are fixedly arranged at the top supporting ends of the first support and the second support; first supporting ends are arranged at the tops of the middle sections of the left arch rib and the right arch rib, and second bent frame columns are fixedly arranged at the first supporting ends; the t