The invention discloses a smart home logic control method and system based on the KNX bus protocol. The smart home logic control method comprises the steps that firstly, smart home devices are grouped according to set demands, and the addresses of the grouped smart home devices, the addresses of the smart home device groups and the initial states of the grouped smart home devices are set based on the KNX bus protocol; secondly, control orders are transmitted to a KNX bus through an upper computer in the mode of messages of the addresses of the smart home device groups, a logic controller receives the control orders from the KNX bus, and analysis and judgment based on combinational logical operation and sequential logic operation are conducted on the control orders; finally, the logic controller sends the orders according with the control logic to the KNX bus in the mode of the messages of the addresses of the groups according to the timing sequence, and then intelligent control over a smart home is achieved. By the adoption of the smart home logic control method and system based on the KNX bus protocol, combinational logic verification and sequential logic deduction of the system control orders are achieved, the intelligence level of a smart home system is improved, and the accuracy of intelligent control is guaranteed.