The invention provides a wearable auxiliary device for equipment maintenance and a visual guidance method for the equipment maintenance. The wearable auxiliary device includes but is not limited to a head mounted sensor bracket, a depth vision sensor, a wearable processor, a handheld flat-panel liquid crystal display and a back-end server. The visual maintenance guidance method can provide key auxiliary functions, such as equipment guidance approach, equipment state identification, equipment maintenance and assembly visualization virtual guidance, for workers. When the workers are not familiar with to-be-maintained objects and assembly operation steps, the device and the method can help the workers, and the working efficiency and the operation standardization and accuracy of the workers are improved.