The invention discloses a theorem-of-three-centers verification platform comprising a driving mechanism, a four-rod mechanism, a first outer rod, a second outer rod, and an outer rod synchronous in-place detection device used for detecting whether the first outer rod and the second outer rod are simultaneously in place. One rod of the four-rod mechanism is a first driving rod which is driven by the driving mechanism to rotate. The first outer rod and the second outer rod are respectively connected to two connecting rods connected with the first driving rod. According to the invention, students are enabled to better understand and apply the theorem of three centers, the theorem of three centers can be demonstrated intuitively and vividly, and that the first outer rod and the second outer rod simultaneously reach a point O can be determined cleverly through the fact that soft magnetic metal balls on the first outer rod and the second outer rod simultaneously fall off at the point O, namely, the three points are exactly in the same line, thereby verifying the theorem of three centers.