A ratchet clamp comprising a first clamping arm, a second clamping arm and a ratchet mechanism, the first clamping arm and the second clamping arm are pivotally connected to each other via a connecting shaft so as to be opened and closed relative to each other, the ratchet mechanism is provided between the first clamping arm and the second clamping arm, wherein the ratchet mechanism comprises: a ratchet toothed assembly provided on the first clamping arm, the ratchet toothed assembly comprising at least two racks (31, 32), each of the at least two racks (31, 32) having a plurality of ratchet teeth (311, 312, 321), the ratchet teeth (311, 312, 321) on the different racks are juxtaposed and misaligned with each other; a swing assembly provided on the second clamping arm, the first clamping arm and the second clamping arm respectively drive the swing assembly and the ratchet toothed assembly to move away from or towards each other with the connecting shaft as the axial center of rotation; and a control member having a latch portion and a trigger portion, the latch portion having at least two pawls (432, 433, 442), each of the at least two pawls (432, 433, 442) having at least two ratchet teeth, wherein the ratchet teeth on the different pawls are juxtaposed and misaligned with each other; and the trigger portion is used for toggling the control member, so that the pawls (432, 433, 442) of the latch portion and the racks (31, 32) of the ratchet toothed assembly are moved between an engaged position and a released position; the ratchet teeth on only one of the racks (31, 32) are engaged with the corresponding ratchet teeth of the pawls (432, 433, 442) and the other racks are not engaged with the corresponding ratchet teeth of the pawls (432, 433, 442) when the latch portion is moved to the engaged position, and all of the racks (31, 32) and the pawls (432, 433, 442) are simultaneously released when the latch portion is moved to the released position; and an elastic component provided between the trigger portion and the second clamping arm so that the ratchet teeth on at least one of the racks and the ratchet teeth of a corresponding pawl are held in engagement. a ratchet toothed assembly provided on the first clamping arm, the ratchet toothed assembly comprising at least two racks (31, 32), each of the at least two racks (31, 32) having a plurality of ratchet teeth (311, 312, 321), the ratchet teeth (311, 312, 321) on the different racks are juxtaposed and misaligned with each other; a swing assembly provided on the second clamping arm, the first clamping arm and the second clamping arm respectively drive the swing assembly and the ratchet toothed assembly to move away from or towards each other with the connecting shaft as the axial center of rotation; and a control member having a latch portion and a trigger portion, the latch portion having at least two pawls (432, 433, 442), each of the at least two pawls (432, 433, 442) having at least two ratchet teeth, wherein the ratchet teeth on the different pawls are juxtaposed and misaligned with each other; and the trigger portion is used for toggling the control member, so that the pawls (432, 433, 442) of the latch portion and the racks (31, 32) of the ratchet toothed assembly are moved between an engaged position and a released position; the ratchet teeth on only one of the racks (31, 32) are engaged with the corresponding ratchet teeth of the pawls (432, 433, 442) and the other racks are not engaged with the corresponding ratchet teeth of the pawls (432, 433, 442) when the latch portion is moved to the engaged position, and all of the racks (31, 32) and the pawls (432, 433, 442) are simultaneously released when the latch portion is moved to the released position; and an elastic component provided between the trigger portion and the second clamping arm so that the ratchet teeth on at least one of the racks and the ratchet teeth of a corresponding pawl are held in engagement.