The present disclosure provides a pen, a distance measurement method and a distance measurement device. The pen includes: a housing; a processor configured to receive a triggering instruction, to trigger a distance-measurement circuit to transmit a distance-measurement signal to a to-be-measured object; and the distance-measurement circuit configured to receive the distance-measurement signal reflected by the to-be-measured object. The processor is further configured to: start a timer after the distance-measurement circuit has transmitted the distance-measurement signal to the to-be-measured object, and stop the timer after the distance-measurement circuit has received the distance-measurement signal reflected by the to-be-measured object, to acquire a value of the timer; and calculate a measurement distance between the pen and the to-be-measured object in accordance with the value of the timer.