The invention discloses a method and a device for wind generating set zero-transition dynamic grid connection, and relates to the field of new energy resources. The method comprises the steps of carrying out wind generating set AC / DC converter and DC / AC converter rectification and inversion, acquiring electric physical quantity data of a power grid, a set and a grid-connected switch, detecting zero-transition dynamic grid connection conditions, carrying out grid-connected switch and wind generating set grid-connected inverter coordination control, and carrying out active power flow direction detection and zero-transmission dynamic grid connection control. The device disclosed by the invention is provided with a zero-transition dynamic grid connection signal unit, a zero-transition dynamic grid connection condition detection and active power flow direction detection unit, an electronic power switch unit and a zero-transition dynamic grid connection control unit. Compared with the prior art, the method and the device have the characteristics that a filter is energy-saving, the wind power generation efficiency is improved, the grid voltage quality is improved, and the service life of the grid-connected inverter is prolonged.