The invention discloses a key circuit, a television key board and a television. The key circuit is connected with a television mainboard and a power end. The key circuit comprises a switch module anda voltage division module. The voltage division module is connected with the power end and the switch module, and is used for dividing input voltage of a power end and outputting the divided voltage to the switch module. The switch module is also connected with a signal input port of the television main board and is used for keeping a switch-off or switch-on state according to external control, sothat the voltage dividing proportion of the voltage dividing module is adjusted, the signal input port outputs voltage signals corresponding to voltage values, the key circuit can be applied to television mainboards of different types, a television can be awakened through the switch module when the television is in a standby state, and the universality is high.