A flagpole lamp includes a pole, a socket joint, a circuit board, a positioning base, a waterproof washer, a lucent bar and a pole head. The circuit board, the positioning base and the waterproof washer are fitted in the socket joint. The circuit board has a light disposed through in the positioning base and the waterproof washer respectively. The lucent bar is coupled to the socket joint at one end, and the pole head put at the opposite end. The light of the circuit board can be lit up to emit light out of the lucent bar to enable a driver to clearly see the head corners and the position of the vehicle.