The invention discloses underwater deep diving detection auxiliary equipment for marine engineering. The underwater deep diving detection auxiliary equipment for marine engineering comprises a shell,a clamping block and a base, wherein a control plate is arranged at the position of the middle of a side surface of the top of the shell; a row of buttons are arranged on the control plate; a cover plate is arranged on the shell and positioned on one side of the control plate; two fixing blocks are arranged on the top of the cover plate side by side; a rotating rod is arranged between the two fixing blocks; the rotating rod is in sleeving connection with a connecting block; and a dust cover is arranged on one side of the connecting block. The underwater deep diving detection auxiliary equipment for marine engineering support artificial control, when a far place needs to be detected, a knob is adjusted rotatably, the focal lengths of cameras are adjusted through an adjuster, more detectioninformation can be recorded simultaneously, by pushing the buttons on the control plate, different shooting modes are switched over, the corresponding camera can detect the conditions behind an underwater worker, when in special circumstances, a worker above water can remind the underwater worker about the environment behind the underwater in time, and accidents are avoided.