Sugar Ray Leonard -- 5 Year Restraining Order Against Stalker ... My Life's In Danger

Sugar Ray Leonard just got EVEN MORE protection from a man who allegedly threatened to shoot and kill the boxer and his family ... TMZ Sports has learned.

We broke the story ... Leonard had previously obtained a short-term restraining order against 55-year-old Mark Anthony Francisco ... claiming he's been waging a campaign of terror against the Leonard family since 2008.

Leonard claimed he was receiving terrifying handwritten notes, harassing phone calls and says Francisco even showed up to his home one day.

Thursday, Leonard and his family appeared in court and begged the judge to extend and strengthen the protection order against Francisco -- and the judge obliged.