The invention discloses a double splicing curvilinear type gear hob comprising a plurality of hob teeth. The tooth-shaped contour line of each hob tooth comprises a first tooth root straight line, a first main cutting straight line, a first auxiliary cutting straight line, a first tooth top curve, a second tooth top curve, a second auxiliary cutting straight line, a second main cutting straight line and a second tooth root straight line which are connected sequentially, wherein the first tooth top curve and the first auxiliary cutting straight line are connected and are tangential at the connection point, the second tooth top curve and the second auxiliary cutting straight line are connected and are tangential at the connection point, the first tooth top curve and the second tooth top curve are connected and are tangential at the connection point, the first tooth top curve is composed of a first top arc and a first bottom arc which are connected, the second tooth top curve is composedof a second top arc and a second bottom arc which are connected, the first top arc is connected to the second top arc, the first bottom arc is connected to the first auxiliary cutting straight line, and the second bottom arc is connected to the second auxiliary cutting straight line. The double splicing curvilinear type gear hob has the beneficial effects that a machined gear has high tooth root strength.