The invention discloses a sealing device of a woven bag. The sealing device of the woven bag comprises a main body, a fixing block, a sealing box, a pushing and moving mechanism, a conveying box and aplurality of extruding mechanisms, wherein each extruding mechanism comprises a lifting groove, a lifting rod, a guide rod, a telescopic groove, a spring, a rolling unit and two limiting units; and the pushing and moving mechanism comprises a rotating wheel, a rotating shaft, a first gear, a second gear, a fixing shaft, a rotary plate, a swing rod, a moving box and a moving unit. The sealing device of the woven bag can prevent the woven bag from shifting in a sealing process through an extruding mechanism, and the opening sealing line of the woven bag is prevented from being inclined; and moreover, through the pushing and moving mechanism, the sealing device of the woven bag can push out materials entering a sealing area of the woven bag, a bag wall of the woven bag and the material are prevented from being fixed together, so that a notch is prevented from being formed in the woven bag, and then the sealing effect of the woven bag is improved.