Provided are a method and apparatus for re-transmitting multi-input multi-output (MIMO) broadcasting signals, and more particularly, to a method and apparatus for efficiently re-transmitting MIMO broadcasting signals to a receiving terminal by using an existing cable without installing an additional cable, when a receiver transmits MIMO broadcasting signals to the receiving terminal via a cable. According to an aspect of the present invention, there is provided a method of re-transmitting a MIMO broadcasting signal, the method including restoring an original signal by receiving a MIMO broadcasting signal via a multi-antenna; re-modulating the restored MIMO broadcasting signal; transmitting the re-modulated MIMO broadcasting signal to a receiving terminal via a cable; and demodulating the transmitted MIMO broadcasting signal in the receiving terminal. A MIMO broadcasting signal is re-transmitted, and a radio frequency (RF) signal can be efficiently transmitted via a cable by modulating a plurality of RF signals to a RF broadcasting signal according to the method of the present invention.