Visual terminal strip, handheld self-checking instrument and application

The invention discloses a visual terminal strip, a handheld self-checking instrument and application, and relates to the technical field of power equipment. The terminal strip comprises a wiring terminal body, a fastener and a fastening bolt, and further comprises a window arranged on the wiring terminal body and a color block arranged on the fastening bolt, the rotating fastening bolt drives the color block to move on the wiring terminal body, and the moving color block is located inside or outside the window; the self-checking instrument comprises a shell, and a controller, a camera, an input setting unit and an alarm unit which are all fixed on the shell, the camera is used for obtaining color information of color blocks in a window of the wiring terminal body, the input setting unit is electrically connected with the controller, the camera is electrically connected with the controller, and the controller is electrically connected with the alarm unit; the method is used for obtaining the state of the faste