The invention provides an adjustable clamp, and relates to the technical field of clamps. The adjustable clamp comprises a fixing seat, a driving mechanism, a clamping arm set and an engagement and disengagement assembly. The fixing seat is used for containing to-be-fixed assembly parts. The clamping arm set comprises a plurality of clamping arms. The clamping arm set is used for clamping the assembly parts. The driving mechanism can drive the clamping arms to be close to or away from the assembly parts at the same time, and the at least one clamping arm is connected with the driving mechanismthrough the engagement and disengagement assembly. The adjustable clamp can drive the clamping arms to be close to or away from the assembly parts at the same time through the driving mechanism, andthe driving mechanism and the clamping arm set can be connected or separated through the engagement and disengagement assembly, so that assembly parts in different shapes can be better matched, operation is simpler when the assembly parts are changed, and the changing efficiency is improved.