The invention discloses a vehicle-mounted water cup structure for improving traffic safety. The vehicle-mounted water cup structure for improving the traffic safety comprises a cup body, wherein a water inlet and a straw hole are formed in the cup body, a straw assembly and a cross bar are arranged on the cup body, the cross bar is connected with a support assembly, a first limiting assembly is arranged on the support assembly, the straw assembly comprises a straw, a sliding rod and a spring, the cross bar is fixedly connected with the cup body, the support assembly comprises a support pillarand a support rod, and the first limiting assembly comprises a connection block, a first connection rod, a second connection rod, an inclined board, an arc rubber pressing block and a limiting plate.The vehicle-mounted water cup structure for improving the traffic safety is simple in structure and convenient to operate, and by using the vehicle-mounted water cup structure for improving the traffic safety, a user directly drinks water through the straw, and does not need to open or close a cup cover, the cup body is pushed back after the user drinks the water, then the straw automatically retracts into the cup body after the water cup returns to a normal position, the straw hole is covered with the arc rubber pressing block in a sealed mode, the water in the cup body is prevented from splashing out, outward splashing trouble of the water is avoided, and water drinking safety in vehicle running is effectively improved.