A multi-winding inductor comprising: a magnetic core comprising a first cover plate, a second cover plate, a first magnetic column, a second magnetic column and a third magnetic column, the first cover plate and the second cover plate being arranged oppositely, the first magnetic column, the second magnetic column and the third magnetic column orderly arranged counterclockwise, and two ends of each of the first magnetic column, the second magnetic column and the third magnetic column being respectively connected to the first cover plate and the second cover plate, and a winding assembly comprising a first winding and a second winding; each of the first winding and the second winding comprising a first portion, a second portion and a third portion; wherein the first portion and the third portion are connected through the second portion in each of the first winding and the second winding; the first magnetic column is arranged between the first portion of the first winding and the first portion of the second winding; the second magnetic column is arranged on one side of the first portion of the first winding and the third portion of the second winding; and the third magnetic column is arranged between the third portion of the first winding and the third portion of the second winding; wherein the first portion of the first winding extends to a first surface of the magnetic core and forms a first pin of the multi-winding inductor on the first surface of the magnetic core; the third portion of the first winding extends to a second surface of the magnetic core and forms a second pin of the multi-winding inductor on the second surface of the magnetic core; the first portion of the second winding extends to the first surface of the magnetic core and forms a third pin of the multi-winding inductor on the first surface of the magnetic core; the third portion of the second winding extends to the second surface of the magnetic core and forms a fourth pin of the multi-wining inductor on the second surface of the magnetic core; and the first surface and the second surface of the magnetic core are arranged oppositely, wherein the first winding and the second winding are arranged crosswise such that the second portion of the first winding and the second portion of the second winding are overlapped. a magnetic core comprising a first cover plate, a second cover plate, a first magnetic column, a second magnetic column and a third magnetic column, the first cover plate and the second cover plate being arranged oppositely, the first magnetic column, the second magnetic column and the third magnetic column orderly arranged counterclockwise, and two ends of each of the first magnetic column, the second magnetic column and the third magnetic column being respectively connected to the first cover plate and the second cover plate, and a winding assembly comprising a first winding and a second winding; each of the first winding and the second winding comprising a first portion, a second portion and a third portion; wherein the first portion and the third portion are connected through the second portion in each of the first winding and the second winding; the first magnetic column is arranged between the first portion of the first winding and the first portion of the second winding; the second magnetic column is arranged on one side of the first portion of the first winding and the third portion of the second winding; and the third magnetic column is arranged between the third portion of the first winding and the third portion of the second winding; wherein the first portion of the first winding extends to a first surface of the magnetic core and forms a first pin of the multi-winding inductor on the first surface of the magnetic core; the third portion of the first winding extends to a second surface of the magnetic core and forms a second pin of the multi-winding inductor on the second surface of the magnetic core; the first portion of the second winding extends to the first surface of the magnetic core and forms a third pin of the multi-winding inductor on the first surface of the magnetic core; the third portion of the second winding extends to the second surface of the magnetic core and forms a fourth pin of the multi-wining inductor on the second surface of the magnetic core; and the first surface and the second surface of the magnetic core are arranged oppositely, wherein the first winding and the second winding are arranged crosswise such that the second portion of the first winding and the second portion of the second winding are overlapped.