An apparatus supplying a clock in a multiline radio transmission system. The apparatus includes a clock generator for generating a clock from a reference signal, a clock branching module for receiving the clock generated from the clock generator and branching the clock, at least one clock patching module for receiving the branched clock from the clock branching module and patching the clock, and a clock distribution module for receiving the patched clock from the clock patching module and distributing the clock to each unit for receiving a clock of the multiline radio transmission system.