Multifunctional vehicle-mounted headrest

The multifunctional vehicle-mounted headrest comprises a headrest back plate, a first sliding way is arranged in the middle of the headrest back plate in a penetrating mode, and first sawtooth belts are arranged at the upper end and the lower end of the first sliding way correspondingly; two parts of the hook-and-loop fastener are respectively arranged on the headrest back plate and the headrest cover; the support fixing back plate and the headrest back plate are arranged at intervals, a second sliding way is arranged in the middle in a penetrating mode, and second sawtooth belts are arranged at the upper end and the lower end of the second sliding way; the connecting assembly sequentially penetrates through the two slideways and is in sliding fit with the slideways, and sawtooth parts matched with the sawtooth belts are arranged at the two ends of the connecting assembly; the mobile phone support assembly is arranged on the side, away from the headrest back plate, of the support fixing back plate. The multif