The invention discloses a high-capacity lithium thionyl chloride energy type battery and a preparation method thereof, wherein the high-capacity lithium thionyl chloride energy type battery is characterized in that a cylindrical positive electrode carbon ring, which is tightly attached to a side surface diaphragm and is formed by granular materials in a pressing mode, is arranged in a negative electrode lithium sheet; a cavity for filling an electrolyte is formed in the positive electrode carbon ring, and a current collector is tightly attached to the inner wall of the positive electrode carbon ring; a surface membrane component which is matched with the current collector to prevent particle material leakage is arranged on the top of the positive electrode carbon ring; and the current collector is connected with a positive electrode cover set. According to the battery, the annular current collector with an opening is extremely easy to install; a positive electrode ball material is pressed into the positive electrode carbon ring; when the current collector is assembled, the outer diameter is reduced and then is loaded into the positive electrode carbon ring by extrusion; the material of the current collector has certain elasticity, so that the outer wall of the current collector after rebounding and the positive electrode carbon ring are well attached, and no damage is caused tothe inner wall of the positive electrode carbon ring; and meanwhile, the internal resistance is lowered, so that it is ensured that the internal resistance increase of the battery is relatively low in the later period.