A sealant dispenser, comprising a bottle being filled with a chemical sealant, 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; a cap mounted to the bottle for covering 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, the cap being threadedly mounted to a neck portion of the bottle which defines the top opening; a control element 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 element when the sealant dispenser is not in use; and a serving element pivotally mounted on the cap for actuating the control element 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, 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 and the sealant passage, the upper pipe being formed with two opposite supporting plates at its top, thus defining a gap between the supporting plates, each supporting plate defining a pivot hole, 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, one of the supporting plates having an extension on which an engagement protrusion with a slant surface is provided; the serving element is pivotally mounted to the pivot holes, between the supporting plates of the upper pipe, such that the serving element can swing about the pivotal holes in a semicircle, whereby via the swing operation of the serving element and the downward movement of control element via the elongated rod the air passage of the air input connection tube and the inner passage of the lower pipe can be opened to allow the compressed air to flow into the inner space of the bottle to force the chemical sealant to flow into the inner passage of the lower pipe and the inner passage of the upper pipe and finally enter a punctured tire through the sealant passage and a hose connected to the sealant passage for inflating and repairing the punctured tire; a compression spring being fitted into the upper pipe such that it is in contact with a step formed at the inner passage of the lower pipe; a non-circular elongated rod fitted into the inner passages of the upper and lower pipes being inserted through the compression spring, the control element having a tube defining therein a central bore and the lower pipe being inserted into the central bore of the tube of the control element via a top opening of the control element and thus closing the inner passage of the lower pipe; a swing operation of the serving element allows the elongated rod to move the control element downwardly to open the air passage and the sealant passage, respectively; the tube of the control element being provided with an inner stepped plug opposite to the top opening thereof and defining multiple gaps at its bottom, around the inner stepped plug, the lower end of the lower pipe being snugly fitted over the inner stepped plug, and a lower end of the elongated rod is in contact with the inner stepped plug of the control element. ".