The invention discloses an operation apparatus of a tumor operation robot, and belongs to the field of medical care apparatuses. The operation apparatus comprises an executing piece, a long pipe and adriving piece, wherein the executing piece is connected with the long pipe; the long pipe is connected with the driving piece; the driving piece is used for driving the executing piece by the long pipe to be in contact with the human body tissue so as to realize operation commands; the executing piece comprises an upper jaw, a lower jaw, a connector and a push rod, wherein the upper jaw and the lower jaw are hinged at the connector; the connector is fixedly connected with the long pipe; the long pipe is used for fixing the upper jaw and the lower jaw through the connector; the near end of thepush rod is connected with the driving piece; the push rod is driven by the driving piece; two pushing arms which are mutually in parallel are arranged at the far end of the push rod; the driving piece is used for driving the push rod to further drive the push arms to move along sliding grooves; and the pushing arms control the opening and the closing of the upper jaw and the lower jaw along thesliding grooves to realize the operation commands.