A multi-functional auxiliary headrest for car seat is disclosed. The auxiliary headrest comprises a body mounted with a suspension strap at the rear side of the seat and one side of suspension strap being stitched and the other side having a male Velcro fastener, and the center of the suspension strap being a female Velcro, characterized in that the auxiliary headrest is provided with a securing strap or a securing strap stitched onto a seat cover, and the securing strap is positioned at the suspension strap at the back of the auxiliary headrest, and the securing strap and the seat cover are secured to the headrest at the car seat, the suspension strap of the auxiliary headrest passes through the securing strap such that the male Velcro can be freely mounted to adapt to the physical size of the driver.