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Provided are a method and apparatus for accessing a channel in a wireless powered communication network. A channel access method in a wireless powered communication network includes performing a random backoff contention using a predetermined initial contention window value in order to access a channel in a wireless powered communication network, transmitting, to a relay hybrid access point, a request to send (RTS) packet to request data transmission or energy reception based on remaining energy when the random backoff contention is successful, and increasing the initial contention window value by a predetermined multiple when a collision occurs in the transmission of the transmitted RTS packet, and performs a random backoff contention again.