Multipurpose quick tool having replaceable teeth

The invention relates to a multipurpose quick tool having replaceable teeth, which is suitable for being used for quickly tightening or loosening various nuts (bolts) and pipes and twisting abnormally shaped workpieces. The tool comprises a handle, a hook-shaped jaw and a spring fixing structure, wherein the head is in a semi-circular shape; the whole semi-circular part is a detachable and exchangeable replaceable tooth; an anti-sliding toothed part of a jaw head ventral part is also a detachable and exchangeable replaceable tooth; the back parts of the two detachable and exchangeable replaceable teeth are both provided with bayonets; the bayonets have a shape of forked tail, thereby preventing the replaceable teeth from dropping off; and a replaceable tooth fixing pin nail is inserted into each replaceable tooth from the head part of the jaw, in order to prevent the replaceable teeth from sliding aside.