A sealant dispenser, comprising: a bottle filled with a chemical sealant; a cap mounted over a top opening of the bottle, the cap defining an air passage for receiving compressed air from an air compressor and defining a sealant passage for delivering the chemical sealant to an object; a control valve mounted in the bottle for controlling the air passage and the sealant passage, wherein the air passage and the sealant passage are closed by the control valve when the sealant dispenser is not in use; and a rotating means provided on the bottle for actuating the control valve to open the air passage and the sealant passage, so that the compressed air can flow into the bottle to deliver the chemical sealant to the object via the sealant passage wherein the bottle has a flat bottom and defines therein an inner space which opens out at the top opening, the chemical sealant being contained in the inner space of the bottle; characterized in that the cap is integrally formed with an upper pipe thereon and a lower pipe thereunder, the upper and lower pipes respectively defining inner passages communicating with each other, the upper pipe being provided with an air input connection tube defining the air passage and provided with a sealant output connection tube defining the sealant passage, the cap being threadedly mounted to a neck portion of the bottle which defines the top opening; a non-circular elongated rod being fitted in the inner passages of the upper and lower pipes; the control valve has a tube defining therein a central bore which opens out at a top opening thereof, the tube of the control valve being provided at its bottom with an inner stepped plug opposite to the top opening thereof and defining at its bottom multiple gaps around the inner stepped plug, the lower pipe being inserted into the central bore of the tube of the control valve via the top opening of the control valve such that a lower end of the lower pipe is snugly fitted over the inner stepped plug and thus closes the inner passage of the lower pipe, and a lower end of the elongated rod is in contact with the inner stepped plug of the control valve; the rotating means is a rotary handle mounted over the upper pipe of the cap to touch the elongated rod; whereby rotation of the rotary handle allows the elongated rod to move the control valve downwardly, so that the inner passage of the lower pipe can be opened to allow the chemical sealant to flow into the inner passage of the lower pipe and finally enter a punctured tire through the sealant passage and a hose connected thereto for inflating and repairing the punctured tire. a bottle filled with a chemical sealant; a cap mounted over a top opening of the bottle, the cap defining an air passage for receiving compressed air from an air compressor and defining a sealant passage for delivering the chemical sealant to an object; a control valve mounted in the bottle for controlling the air passage and the sealant passage, wherein the air passage and the sealant passage are closed by the control valve when the sealant dispenser is not in use; and a rotating means provided on the bottle for actuating the control valve to open the air passage and the sealant passage, so that the compressed air can flow into the bottle to deliver the chemical sealant to the object via the sealant passage wherein the bottle has a flat bottom and defines therein an inner space which opens out at the top opening, the chemical sealant being contained in the inner space of the bottle; characterized in that the cap is integrally formed with an upper pipe thereon and a lower pipe thereunder, the upper and lower pipes respectively defining inner passages communicating with each other, the upper pipe being provided with an air input connection tube defining the air passage and provided with a sealant output connection tube defining the sealant passage, the cap being threadedly mounted to a neck portion of the bottle which defines the top opening; a non-circular elongated rod being fitted in the inner passages of the upper and lower pipes; the control valve has a tube defining therein a central bore which opens out at a top opening thereof, the tube of the control valve being provided at its bottom with an inner stepped plug opposite to the top opening thereof and defining at its bottom multiple gaps around the inner stepped plug, the lower pipe being inserted into the central bore of the tube of the control valve via the top opening of the control valve such that a lower end of the lower pipe is snugly fitted over the inner stepped plug and thus closes the inner passage of the lower pipe, and a lower end of the elongated rod is in contact with the inner stepped plug of the control valve; the rotating means is a rotary handle mounted over the upper pipe of the cap to touch the elongated rod; whereby rotation of the rotary handle allows the elongated rod to move the control valve downwardly, so that the inner passage of the lower pipe can be opened to allow the chemical sealant to flow into the inner passage of the lower pipe and finally enter a punctured tire through the sealant passage and a hose connected thereto for inflating and repairing the punctured tire.