A multifunctional curved training device, comprising: a first main body, in an U shape, comprising a first middle portion and a first left branch and a first right branch respectively extending in the same direction from two ends of the first middle portion and parallel to each other, a first supporting bracket being provided between the first left branch and the first right branch, wherein the first supporting bracket comprises a first left supporting portion, a first right supporting portion and a first middle supporting portion, one end of the first left supporting portion is connected to the first left branch, one end of the first right supporting portion is connected to the first right branch, and one end of the first middle supporting portion is connected to the first middle portion; a second main body, in an U shape, comprising a second middle portion and a second left branch and a second right branch respectively extending in a same direction from two ends of the second middle portion and parallel to each other, a second supporting bracket being provided between the second left branch and the second right branch; a left elastic connecting member, arched in shape, the left elastic connecting member comprising a left spring and a left flexible sleeve enveloping an outer periphery of the left spring, two ends of the left elastic connecting members respectively being connected to the first left branch and the second left branch; and a right elastic connecting member, arched in shape, the right elastic connecting member comprising a right spring and a right flexible sleeve enveloping an outer periphery of the right spring, two ends of the right elastic connecting member respectively being connected to the first right branch and the second right branch. a first main body, in an U shape, comprising a first middle portion and a first left branch and a first right branch respectively extending in the same direction from two ends of the first middle portion and parallel to each other, a first supporting bracket being provided between the first left branch and the first right branch, wherein the first supporting bracket comprises a first left supporting portion, a first right supporting portion and a first middle supporting portion, one end of the first left supporting portion is connected to the first left branch, one end of the first right supporting portion is connected to the first right branch, and one end of the first middle supporting portion is connected to the first middle portion; a second main body, in an U shape, comprising a second middle portion and a second left branch and a second right branch respectively extending in a same direction from two ends of the second middle portion and parallel to each other, a second supporting bracket being provided between the second left branch and the second right branch; a left elastic connecting member, arched in shape, the left elastic connecting member comprising a left spring and a left flexible sleeve enveloping an outer periphery of the left spring, two ends of the left elastic connecting members respectively being connected to the first left branch and the second left branch; and a right elastic connecting member, arched in shape, the right elastic connecting member comprising a right spring and a right flexible sleeve enveloping an outer periphery of the right spring, two ends of the right elastic connecting member respectively being connected to the first right branch and the second right branch.