The invention provides a motor pulling type material belt tension control mechanism which is applied to cell production devices. According to the motor pulling type material belt tension control mechanism, a motor drives a floating rolling cylinder to control the tension of a material belt; a sliding linear rail which is fixed on a base plate is located in a tension buffering area of the material belt; the floating rolling cylinder which is installed on the sliding linear rail is used for tensioning a material belt portion which is arranged inside the tension buffering area; a tensile motor which is a servo motor which is rapid in reaction speed is installed on the base plate and the floating cylinder is pulled to move in a linear mode along the sliding linear rail through a flexible transmission part to keep the tension of the material belt; a position sensor which is a magnetostrictive sensor is used for detecting position values of the floating rolling cylinder on the sliding linear rail and providing information for controlling the buffering length of the material belt portion which is arranged inside the tension buffering area; the torque of the servo motor can be accurately set due to the facts that the frictional force between a motor rotor and the flexible transmission part is small and the movement inertia is small and accordingly the tension of the material belt can be accurately controlled, the running speed of the material belt can be improved, and the cell production ratio can be improved.