The invention provides a seabed bottom type measurement apparatus bottoming process combined determination method and device. The method includes that an underwater magnetic trigger switch and an acoustic velocity measuring device are arranged on a bottom type measurement apparatus, whether the device is at the bottom is determined by the relative position change of the magnetic part and the switch element of the magnetic trigger switch; based on the big difference of acoustic velocity in the air and water, whether the device is in the air or water is determined by the acoustic velocity measuring device; and by means of the two outputs (bottoming and non-bottoming signals) of the magnetic trigger switch and the two outputs of the sound velocity measuring device (air velocity and water velocity), the four states, namely, the deck parking state, the deck hoisting state, the underwater hoisting state, and the seabed bottoming state, of the device from the research vessel deck to the seabed are distinguished. The method is simple in principle, high in operationality, and easy to realize, fully utilizes the technologies in the prior art, e.g. the magnetic trigger switch, a minisize CTD or a minisize SVP (for acoustic velocity measurement) etc., and greatly improves the reliability and prevents misoperation.