The invention relates to a non-sealed channel type continuous zinc impregnation device and method. The non-sealed channel type continuous zinc impregnation device comprises a channel, a preheating and heat preservation system, a heating and heat preservation system, a protective gas applying device, a zinc powder applying device and a conveying system, wherein the channel is composed of a plurality of sections; one end of each section is provided with a workpiece inlet, and the other end of each section is provided with a workpiece outlet; one or several sections serve as zinc impregnation sections which are internally provided with zinc impregnation spaces; heating elements of the heating and heat preservation system are arranged on the zinc impregnation sections; a protective gas conveying opening of the protective gas applying device communicates with the zinc impregnation spaces; a zinc powder conveying opening of the zinc powder applying device communicates with the zinc impregnation spaces; the conveying system is provided with a workpiece conveying part for conveying a metal workpiece along the predetermined route; and a part of the predetermined route of the workpiece conveying part is arranged along the workpiece inlets, the channel and the workpiece outlets. Gas protection atmospheres are formed in the zinc impregnation spaces, thus, zinc impregnation can be conducted in the open type channel, the zinc impregnation process can be continuously conducted, a lot of time occupied by temperature rise and temperature reduction of each furnace can be saved, the production efficiency is improved, and the caused energy wasting can also be avoided.