Abstract: The present disclosure is related to an indoor/outdoor light decoration asssembly operable by either AC or DC power source, including a number of light strings sealedly disposed in corresponding transparent tubular holders which are well guarded against rain or snow. The tubular holders are electrically associated in parallel; and a battery box having a pair of strings of female sockets connected to each other in parallel extended therefrom so that the male plugs disposed at the end of the light strings can be engaged therewith. The present article is provided with a pointed ground fixing member and a support base which is selectively engaged with the former so that the present light decoration assembly can also be placed in any indoor/outdoor places as desired.