The invention relates to an insulating support of an arc extinction coil, an arc extinguishing chamber contact and an arc extinguishing chamber. The arc extinguishing chamber comprises the arc extinguishing chamber contact that comprises a contact seat, the insulating support installed on the contact seat and the arc extinction coil wound on the peripheral surface of the insulating support, wherein the insulating support has a top end close to a broken part and a bottom end far away from the broken part, and a coil positioning structure used for positioning at least one turn of a coil positioned between the top end and the bottom end of the arc extinction coil along the axial direction of the insulating support is arranged on the insulating support. According to the abovementioned scheme,the ordered arrangement of each turn of the arc extinction coil is facilitated, the winding efficiency and winding quality are improved, and the situation that the coil is non-uniformly and disorderedly wound due to the variation of the diameter of the winding part of the coil can be avoided.