The invention relates to a device for assisting passengers to rest on a train seat. The device comprises a detachable tie ring, wherein the detachable tie ring is arranged at the upper part of the rear back of the train seat and is connected by a connecting band. The device further comprises a first head holder connected with the detachable strap collar through a first connection part with adjustable length, and the first connection part with adjustable length is connected with the connection band. The device further comprises a chin support connected to the first head holder; and a fixing legring connected with the detachable strap ring through a second connecting part with adjustable length, wherein the second connecting part with adjustable length is connected with the connecting band.The device can solve the problem of long-distance train sleeping fatigue, can well protect people's neck and cervical vertebra from strain, and can greatly increase the comfort degree of train passengers when they ride on a train hard seat.