The invention discloses a car window touch switch device and a control method thereof, and belongs to the field of in-car electronics. The car window touch switch device comprises a key identificationmodule, a backlight control module, a key control module and a car window motor driving module. The key identification module and the key control module are connected through an I2C bus. The backlight control module and the key control module are connected through an SPI bus. The car window motor driving module and the key control module are connected through an LIN bus. The key identification module is used for identifying key signals, converting analog quantity signals into digital signals and sending the digital signals to the key control module through the I2C bus. After receiving the keysignals through the I2C bus, the key control module sends control commands for controlling the corresponding backlight RGB color or brightness to be converted to the backlight control module throughthe SPI bus, and meanwhile, sends control commands for driving corresponding car window motors to the car window motor driving module through the LIN bus, and thus the effect of controlling car windows is achieved.