The embodiment of the invention provides a communication method for a battery management system and the battery management system. The battery management system comprises a plurality of chips and a plurality of batteries. The plurality of batteries are connected in series. Each chip manages one battery. Each chip comprises an uplink first in first out FIFO queue and a downlink first in first out FIFO queue. The uplink FIFO queue and the downlink FIFO queue multiplex a shared pointer. The method comprises the steps of adjusting the shared pointer to point to middle positions of the uplink FIFOqueue and the downlink FIFO queue when a current chip receives data transmitted by an upper level chip; transmitting the data to a next level chip and receiving feedback information of the next levelchip; and transmitting the feedback information to the upper level chip when the shared pointer points to the middle position of the uplink FIFO queue or the downlink FIFO queue. According to the embodiment of the invention, uplink data and downlink data are guaranteed to be synchronous, and the communication security of the battery management system is guaranteed.