The utility model discloses a semiconductor LED ball bulb, its structure includes LED bulb cover, LED light emitting module, module base, module base erector, erector base, fixing bolt, bulb base, acoustic control device, bulb installation screw thread post, electric current switch -on piece, the LED light emitting module is installed to inside embedding of LED bulb cover, the utility model relates to a semiconductor LED ball bulb, the structural acoustic control device that is equipped with when carrying out the switch to the bulb, through sounding, makes the sound sensing ware sense sound and produces the signal of telecommunication and order about the electro -magnet and produce suction, and the strength magnets piece is adsorbed to the thrust that makes the electro -magnet resist resetspring to the switch -on is electric current contact and last electric current contact down, makes the electric current can follow electric control line and reaches the LED light emitting module, throws light on easy operation, convenient and fast.