How to cancel the social security of the last company?

Legal analysis: it is closely related to the social security relationship and labor relationship of the unit. As long as the labor contract is not terminated, labor relations will continue to exist, and no enterprise can establish labor relations with you. Only you can go back to your original unit, there is no shortcut.

Legal basis: Article 49 of the Labor Contract Law of People's Republic of China (PRC) stipulates that the state shall take measures to establish and improve the inter-regional transfer and connection system of workers' social insurance relations.