Ocean towing linear array three-blade balance unfolded device and method for determining zero angle of wing plate angle of attack

This invention discloses one sea towing wire array three-blade balance extension device, which comprises pressure enduring shell, execution structure, communication and control device, measurement device and blade board, wherein, the blade board is fixed on the relative part of the shell through shaft and executes is of one or two sets and comprises orderly execution motor, decelerator, clutch, feed screw and line and rotation conversion device; the blade board is composed of vertical extension blade and two level balance blade boards as angle size and reverse direction.