Abstract: A bike stem with angle adjustable includes a drum shaped inner insertion body contained in a linking base provide to a body of the stem; an accommodation portion disposed in the linking base to receive the drum shaped inner insertion body also indicates a drum shape; a spacing is defined between the drum shaped inner insertion body when received in the accommodation portion and a top of the linking base; the drum shaped inner insertion body is inserted and secured onto a fork; a cover is disposed externally to the linking base; a spacing defined between the drum shaped inner insertion body and the drum shaped accommodation portion of the linking base permits the stem to execute longitudinal swing for angular adjustment for the stem to achieve easy adjustment and provide more functionalities.