A circuit for linearly driving LED illumination based on MCU-controlled color temperature switching, comprising: an AC power supply module, configured to supply an input voltage; an LED illumination module connected to the AC power supply module and a Single Chip Micyoco, SCM, color temperature control module, comprising at least two LED bead strings at different color temperatures; wherein the SCM color temperature control module is connected to the AC power supply module, an LED linear dimming driving and control module, and the LED illumination module, respectively, and comprises an SCM input control module, an SCM processing module and a color temperature output control module, wherein the SCM input control module is configured to generate an enable signal to trigger the operation of the SCM processing module, the SCM processing module is configured to perform corresponding processing upon receiving the enable signal and is configured to control the color temperature output control module, the color temperature output control module is configured to output two PWM control signals or multi-channel control signals, to control the ratio of current at the LED bead strings at high and low color temperatures, thus to realize the control of two or more color temperatures, and the LED linear dimming driving and control module is connected to the AC power supply module and the SCM color temperature control module, and is configured to control and adjust the illuminance of the LED illumination module and to realize a dimming function; wherein the SCM input control module comprises two or more of a power switch control module, a DIP switch control module, a key control module, a wireless/WIFI control module, a human body sensing control module, an IR/RF remote control module, a touch control module and a sound control module, and the SCM input control module is configured to control the ratio of current at the bead strings at high and low color temperatures in two or more of different modes comprising power switch, DIP switch, key, wireless/WIFI, human body sensing, IR/RF remote control, touch control and sound control. an AC power supply module, configured to supply an input voltage; an LED illumination module connected to the AC power supply module and a Single Chip Micyoco, SCM, color temperature control module, comprising at least two LED bead strings at different color temperatures; wherein the SCM color temperature control module is connected to the AC power supply module, an LED linear dimming driving and control module, and the LED illumination module, respectively, and comprises an SCM input control module, an SCM processing module and a color temperature output control module, wherein the SCM input control module is configured to generate an enable signal to trigger the operation of the SCM processing module, the SCM processing module is configured to perform corresponding processing upon receiving the enable signal and is configured to control the color temperature output control module, the color temperature output control module is configured to output two PWM control signals or multi-channel control signals, to control the ratio of current at the LED bead strings at high and low color temperatures, thus to realize the control of two or more color temperatures, and the LED linear dimming driving and control module is connected to the AC power supply module and the SCM color temperature control module, and is configured to control and adjust the illuminance of the LED illumination module and to realize a dimming function; wherein the SCM input control module comprises two or more of a power switch control module, a DIP switch control module, a key control module, a wireless/WIFI control module, a human body sensing control module, an IR/RF remote control module, a touch control module and a sound control module, and the SCM input control module is configured to control the ratio of current at the bead strings at high and low color temperatures in two or more of different modes comprising power switch, DIP switch, key, wireless/WIFI, human body sensing, IR/RF remote control, touch control and sound control.