The invention discloses a cloud broadcast system, a blending broadcast system and a cloud broadcast method. The cloud broadcast system comprises a cloud server and a local broadcast system; the cloud server is used for generating a broadcast program list, preparing program materials, and sending the program materials and broadcast control data to the local broadcast system; the local broadcast system receives the program materials and the broadcast control data from the cloud server and controls local equipment to finish broadcast work according to the broadcast control data. The preparation of the larger cost-consumable program materials is moved into the cloud sever by the cloud broadcast system, the blending system and the cloud broadcast method, by using the powerful cloud computing capacity and the cloud storage capacity, while the input of a TV station is reduced, the work efficiency is improved; meanwhile, the preparation work of the program list is put onto the cloud server to facilitate multipoint cooperating operation. Compared with the prior art, the cloud broadcast system, the blending system and the cloud broadcast method have the advantages that the construction cost is low, the construction cycle is short, and the operation, the maintenance and the upgrade are easy.