The invention provides a cathode, a preparation method thereof and a lithium/thionyl chloride battery employing the cathode. Macrocyclic structure compounds, namely transition metal and nitrogen-doped graphene are added to the cathode as catalysts; and the lithium/thionyl chloride battery prepared by the cathode has relatively excellent electrochemical property, so that the discharge voltage and the discharge capacity of the lithium/thionyl chloride battery prepared by the cathode are significantly improved; the catalytic activity retention rate of the lithium/thionyl chloride battery is significantly improved; the catalytic activity retention rate is obviously superior to that of the lithium/thionyl chloride battery prepared by the cathode of a common macrocyclic compound catalyst (such as cobalt phthalocyanine CoPc) in the prior art; the prepared battery is discharged to 2.0V with a discharge test system at a room temperature under the current density condition of 25mA.cm<-2>; the specific discharge capacity reaches 1850mAh.g<-1>; and the discharge voltage is improved by over 180mV.