A method for switching on / off double CPU television set through SCART interface, which contains setting sub-CPU for signal detection and awakening, setting No 1 and No 2 SCART interface, writing the level detection switching on information zone bit of ADC1 and ADC2 in EEPROM of CPU, sub-CPU detecting the switching signal in SCART1 or SCART2 interface and reading out user SCART setting, judging corresponded zone bit, if it 1 then switching on, if it is 0 then no any operation until the remote controller key signal coming and switching according to normal mode, when switching off, the main CPU receiving SCART switching off signal and executing switching off operation according to normal mode. Said invention can reduce power consumption.