Pull type power-on device with watertightness function

The invention discloses a pull type power-on device with the watertightness function. The pull type power-on device with the watertightness function is used for off-plane power-on starting of an onboard automatic throwing type ocean surveying instruments. The pull type power-on device with the watertightness function comprises a sealing shell, a pilot sleeve, a driving pull rope, a stop collar, a release shaft, a sliding shaft, a locking sleeve and a self-locking switch. A parachute drives the driving pull rope in a drawing mode to pull the release shaft, the stop collar is unlocked, the sliding shaft bounces, the self-locking switch enters the closing state to close a power supply circuit, a sealing ring is used for sealing the position of connection between the pull type power-on device and a surveying instrument, a sealing ring is used for sealing the pull type power-on device, and it is ensured that after the surveying instrument enters water, normal measurement work can still be kept. The pull type power