The invention provides a video rebroadcasting 
system and a video receiving 
system, and the method comprises the steps: enabling coding equipment in the video rebroadcasting 
system to code a received ultra-high-definition video 
signal, obtaining an ultra-high-definition video TS flow 
signal, and transmitting the ultra-high-definition video TS flow 
signal to 
signal frequency conversion modulation equipment; enabling the 
signal frequency conversion modulation equipment to carry out modulation and 
frequency conversion on the received ultra-high-definition video TS 
stream signal to obtain a processed TS 
stream signal; wherein the signal power amplification equipment is used for carrying out power amplification on the processed TS 
stream signal to obtain a power amplification signal; and enabling the 
waveguide device to transmit the power amplification signal to a 
satellite transmitting antenna, so that the 
satellite transmitting antenna transmits the power amplification signal to a 
satellite for forwarding use of a 
transponder on the satellite. And after the ground receives the signals forwarded by the satellite, 
frequency conversion power amplification, 
demodulation and decoding are carried out, and ultra-high-definition video signals are recovered to be played or recorded. According to the invention, the transmission efficiency of 8K ultra-high-definition video signals is improved.