The invention discloses a connection structure of a monomer sodium-sulfur cell in a sodium-sulfur cell module, which belongs to the energy storage field, and comprises a first monomer sodium-sulfur cell and a second monomer sodium-sulfur cell, a first cathode tab and a first anode tab are provided on a first monomer sodium-sulfur cell, a second cathode tab and a second anode tab are provided on a second monomer sodium-sulfur cell; and the first cathode tab and the second anode are connected through two roots of busbars. A technical effect is characterized in that the first cathode tab on two roots of busbars and the first monomer sodium-sulfur cell as well as the second anode tab on the second monomer sodium-sulfur cell form a sandwich structure, the contact resistance in the connection structure is effectively reduced, because the cross section of the busbars is in a rectangular shape, under the condition that the cross section areas are same, the surface area of the busbars is smaller, thereby the possibility that the busbars is corroded by sulfur steam or sodium polysulfide steam is reduced, and the contact resistance of the connection structure can keep long time constancy.