The invention discloses a road engineering material maintenance vehicle. The road engineering material maintenance vehicle comprises a trailer chassis, a maintenance tank and a water tank; the maintenance tank and the water tank are arranged on the trailer chassis parallelly, the maintenance tank is a sealed heat preservation tank body, and the water tank is closed; a water injection opening witha water injection plug is formed in the top of the water tank, and an air conditioner, a humidifier, a test-piece support, a water channel, a temperature sensor and a humidity sensor are arranged in the maintenance tank; a PLC and a power supply are arranged outside the maintenance tank, and the water channel and the water tank are connected through a water injection pump; the water channel supplies water to the humidifier, and the water injection pump, the air conditioner, the humidifier, the temperature sensor and the humidity sensor are all connected with the PLC through signal lines; and power lines of the water injection pump, the air conditioner, the humidifier and the PLC are connected with the power supply. The road engineering material maintenance vehicle is provided with the trailer chassis, and thus is convenient to drag by other power devices and easy to move, the temperature and humidity in the maintenance tank can be automatically adjusted according to the setting, the water channel is formed in the maintenance tank, the appropriate amount of water is injected into the water channel before maintenance each time, and the temperature in the maintenance tank is not influenced during humidity adjustment of the humidifier; and the road engineering material maintenance vehicle is provided with the power supply and thus is suitable for fields.