The new worry free smart box is a kind of packaging box which can be recycled for many times. It can be folded into flat board easily and quickly without occupying the recycling volume. When it is used again, just install a new meiyingsen patent lock. Repeated recycling can solve the social problems such as waste of resources and environmental burden existing in the current express packaging, especially in the return and exchange of more expensive clothing, shoes and other products, the return and use is more convenient.