The invention relates to a quick-clamping wrench of a ratchet wheel, which comprises a fixed wrench opening, a movable wrench opening, a push knob, a handle, a first spring, a spring guide bar, a cover plate, a ratchet wheel block, a magnetic sheet, a push rod and a second spring, wherein a groove cavity is arranged on the fixed wrench opening, and the bottom surface of the movable wrench openingis arranged with a ratchet wheel rack; the ratchet wheel block is movably arranged in the groove cavity and can be engaged and connected with the ratchet wheel rack at the bottom surface of the movable wrench opening; the front end of the handle provides a connection head and a groove hole, and the magnetic sheet is installed at the bottom surface of the ratchet wheel block and is connected with the connection head of the handle in a magnetic suction way; and the push rod and the second spring are arranged in the groove hole at the front end of the handle, wherein the push rod is positioned atthe outer side and is connected with the fixed wrench opening in a pressing way. The quick-clamping wrench of the ratchet wheel has skillful concept and simple structure and also has the function ofthe ratchet wheel.