Abstract: A pendulum putting trainer, comprising: a main shaft provided with a handle at one end thereof and a putter head at the other end thereof, the putter head having a striking face and a non-striking face opposite to the striking face; and an auxiliary shaft having a first shaft portion provided with an abutting member at an upper end thereof and a second shaft portion provided with a joining member that connects with the non-striking side of the putter head of the main shaft at a lower end thereof, the auxiliary shaft being arranged obliquely such that it has an included angle with respect to the main shaft; wherein a connecting member is disposed at a location where the first shaft portion and the second shaft portion are connected; and wherein the first shaft portion is hollow and the second shaft portion can move relatively within the first shaft portion and the connecting element, so that a length of the auxiliary shaft can be adjusted to make the auxiliary shaft abut against the user and thereby to help th