哈里（科林·费斯 Colin Firth 饰）是英国秘密特工组织金士曼中的一员，某次行动中，他的战友不幸牺牲，哈里将一枚徽章和一个电话号码交给了战友年幼的小儿子艾格西（亚历克斯·尼科洛夫 Alex Nikolov 饰），叮嘱他将来如果遇到了什么麻烦可以拨打这个号码，然而，这样的机会只能使用一次。 　　一晃眼十七年过去，破碎的家庭让艾格西（塔伦·埃格顿 Taron Egerton 饰）成长为了一个整日无所事事的小混混，某日，因为违反交通规则而遭到逮捕的艾格西使用了手中珍贵的号码，赶来的哈里在艾格西玩世不恭的外表之下发现了他善良的本质和极高的天赋，于是，哈里决定将艾格西培养成为新一代金士曼，他们需要共同面对的是强大而又邪恶的亿万富翁瓦伦丁（塞缪尔·杰克逊 Samuel L. Jackson 饰）。A young man named Eggsy whose father died when he was a young boy, is dealing with living with the creep his mother is with now, who mistreats her and him. He goes out and does something to one of the creep's friends. He gets arrested and he calls a number a man gave him around the time his father died, to call if he needs help. A man named Harry approaches him and tells him he's the one who helped him. He tells him that he knew his father. When the man Eggsy slighted wants some payback, Harry takes care of him and his companions single handed. Harry then tells Eggsy that he's part of a secret organization called the Kingsman and his father was also part of it. He died trying to make the world safe. Harry offers Eggsy the opportunity to be a Kingsman and he takes it. He undergoes a grueling training course. Harry is looking into the demise of another Kingsman and the trail leads him to tech billionaire named Valentine aka V who is also curious about the group following him, the Kingsman.