The invention discloses an ultrasonic leak detector for electric power sealing equipment, and relates to the technical field of the electric power sealing equipment. The ultrasonic leak detector comprises a shell, a power supply module, an ultrasonic detector, a signal processing module, a control module, a display module, a camera shooting assembly, a communication module and a computer, the power supply module supplies power to other modules, the ultrasonic detector sends detected ultrasonic information of the surface of an instrument to the control module after the detected ultrasonic information is processed by the signal processing module, the control module sends the ultrasonic information to the display module so that the ultrasonic information can be displayed, meanwhile, the ultrasonic information is sent to the computer through the communication module, the computer displays the ultrasonic information, the detection process is shot through the camera shooting assembly, detected leakage points are photographed, and a video and pictures are sent to the computer through the communication module to be stored and displayed. Leak point detection is achieved when the electric power sealing equipment is vacuumized, images and detection waveforms obtained during detection can be stored and a user can check the images obtained during detection conveniently at any time.