The invention relates to a planet pin roller spiral device, a manufacturing method and a forced seal ball valve. The planet pin roller spiral device comprises a stud component provided with a stud anda screw hole component provided with a screw hole. A plurality of planet pin rollers are arranged between the stud and the screw hole and arranged between the stud and the screw hole through a retainer. A thread rail replacing groove is formed in the stud in the axial direction, and a top protrusion is arranged at the end of the thread rail replacing groove. An assembling method comprises the steps that a filling-in block is pressed on a leaf spring through a fastening screw via a hot melting gasket, and the leaf spring is compressed towards the bottom face of the thread rail replacing groove; and after the screw hole component is screwed in place, the thread rail replacing groove and the top protrusion part of the stud component are heated, and the filling-in block is elevated under theaction of the leaf spring. The planet pin roller spiral device, the manufacturing method and the forced seal ball valve have the beneficial effects that the friction force in the thread drive processcan be obviously reduced, the operation torque during valve opening and closing is reduced, and the working life of the forced seal ball valve is prolonged.