The invention relates to a thermal-treatment handling mechanical arm buffer. The thermal-treatment handling mechanical arm buffer comprises a lock nut, an adjusting rod, a spring, a sliding plug, a technical plug, a lower oil plug, an upper oil plug, a base body and a push rod, wherein the base body is provided with an upper cavity and a lower cavity which are communicated with each other, the push rod is mounted at the left end of the upper cavity, the upper oil plug is connected at the right end of the upper cavity, the adjusting rod, the spring and the sliding plug are sequentially connected at the left end of the lower cavity, the lower oil plug is connected at the right end of the lower cavity, the technical plug is connected on the lower portion of the lower cavity, and the right side of the push rod of the upper cavity, a communication position of the upper cavity and the lower cavity and the right side of the sliding plug of the lower cavity are filled with liquid. The thermal-treatment handling mechanical arm buffer has the advantages that vibration generated by impact in a process from rotation or linear movement to stop of a mechanical arm can be reduced greatly, positioning precision is improved and service life of the buffer is prolonged.