A mechanically controlled linkage door access way device and an access method are provided. The device comprises a way, an active door component, a driven door component, a free door component, an interlocking rod and a door lock component. The characteristics are that door opening and closing is realized through a planer connecting rod linkage mechanism and a pushing force exerted by animals whenthe animals enter and exit from the way; after the animals enter and the door successfully closes, a door lock and a door can only be controlled by an animal control switch in the way; when the animals move freely or forage, the animals can grasp the opening method of the mechanical linkage door consciously or unconsciously; a large half door and a small half door are at the entrance to allow thepassing of one animal at one time; and the distance and angle between the front linkage door and the back linkage door can be automatically adjusted to allow most animals to smoothly enter and exit from the channel.