The electric starter for opening pressure difference type container valve includes casing, triggering shaft, knife pouch, pricking knife, triggering spring, repositioning spring, electric drive mechanism and handle. Inside the casing, the pricking knife, the knife pouch and the triggering shaft are connected through screws to form a combined shaft; the triggering spring is in the tail of the combined shaft; and the electric drive mechanism has main shaft perpendicular to the combined shaft. The electric starter features the safety assembly comprising two clamping boards, the repositioning spring and clamping board shafts; one double-head cam with rotation shaft connected to the main shaft of the electric drive mechanism; one clutch mounted onto the other end of the main shaft of the electric drive mechanism and one safety buckle set between the clutch and the handle. The present invention is used in automatic fire extinguishing system and has double locking to the triggering shaft and raised reliability.