The invention discloses a performance testing device for a visual rubber packer, which comprises a packer assembly, a test assembly and a display; wherein the testing assembly is connected with the packer assembly and comprises a displacement sensor and a control circuit. The displacement sensor is used for detecting the displacement of the rubber packer and generating a corresponding detection signal; and the control circuit is used for receiving the detection signals, the control circuit is connected with the display, and the display is used for displaying the specific numerical value of thesetting distance and the back-off distance of the rubber packer.