Political Carrier :-
Khattar joined Rashtriya Swayamsevak Sangh (RSS) in 1977, and became a full-time pracharak three years later. As a pracharak, he is a lifelong bachelor. He worked as a full-time pracharak for 14 years before moving to BJP, in 1994.
During 2000–2014, Khattar was Organizational General Secretary of the BJP in Haryana. He was the Chairman of BJP's Haryana Election Campaign Committee for 2014 Lok Sabha Elections. Subsequently, he became a member of BJP's National Executive Committee.
In 2014, Khattar was nominated as BJP's candidate from Karnal constituency for the Haryana Legislative Assembly election, 2014. The party's workers and supporters in Karnal launched a signature campaign, asking the party leadership to field a local candidate instead of him. His opponent, the Indian National Congress candidate, accused Khattar of being an "outsider" not native to Karnal. But Modi wave helped Mr. Khatter win elections by heavy margin.  During his election campaign, in response to a question on Khaps, Khattar stated that girls must not "lure" boys and must wear decent clothes to not attract the opposite sex. He has largely been unsuccessful to curtail mob violence happening multiple times, despite the imposition of prohibitory orders in the state.
In the elections, the BJP gained a majority in Haryana for the first time, and Khattar won his maiden election by a margin of 63,736 votes. During a party meeting, his name was proposed for the Chief Minister of Haryana post by Haryana BJP President Ram Bilas Sharma, seconded by other strong Chief Minister of Haryana claimant Rao Inderjeet Singh and supported by many MLAs. He became the BJP's first Chief Minister of Haryana after his swearing-in ceremony on 26 October 2014