The invention provides a beer fresh-keeping barrel and a manufacturing method and belongs to the field of drink fresh-keeping storage and transportation containers. The beer fresh-keeping barrel comprises a casing, a plastic or stainless steel liner and a heat insulating layer filled between the casing and the liner, a beer filling opening which penetrates through the casing, the heat insulating layer and the liner is arranged at the top of a barrel body, and a beer discharge valve which is communicated with the bottom of the plastic or stainless steel liner is arranged at the lower end of the casing. The manufacturing method includes installing the liner, installing wooden boards one by one, tightening the wooden boards through iron hoops, and finally filling a foaming agent in the middle to support the casing. Compared with beer fresh-keeping barrels and manufacturing methods in prior art, the beer fresh-keeping barrel and the manufacturing method have the advantages that the casing is made of a wooden material with a high quality, the appearance is attractive, and the casing is durable; the liner utilizes a SUS3042B stainless steel plates and is formed by stretching and welding, hygienic dead space is prevented, a beer discharge opening of the liner is closely attached to the barrel bottom, and the liner can bear pressure of 0.4MPa without beer storage; a wine spear can utilize a well type fitting or a flat plate type fitting; a high-performance heat insulation material is utilized; and the beer fresh-keeping barrel is convenient to clean.