The invention discloses a yak weighing, holding and grouping device and method, which comprise a yak neck clamp auxiliary door, a barrier divider and an H-shaped weighing device; the H-shaped weighingdevice comprises a yak incoming door, a yak head extending door, a functional door and a side door; one end of the functional door and one end of the side door are vertically arranged on two sides ofthe yak incoming door, two sides of the yak head extending door are vertically arranged at the other end of the functional door and the other end of the side door, the yak neck clamp auxiliary door is arranged outside the yak head extending door, and the barrier divider is movably arranged outside the yak neck clamp auxiliary door. The problems are solved that weighing precision is low, weighingspeed is slow, yaks cannot be managed in real time in groups, and the yaks cannot be held in the weighing process.