The invention discloses a sun helmet realizing automatic music switching according to brainwave detection. The sun helmet comprises a data transceiver, a solar photovoltaic conversion module, a crystal oscillation circuit, a reset circuit, a music storage chip and a brain wave data acquisition module, wherein the input end of the data transceiver is connected with a voltage and current detection circuit, a key setting circuit and a power switch, the output end of the data transceiver is connected with a voice drive chip, the output end of the voice drive chip is connected with a left channel circuit and a right channel circuit, the brain wave data acquisition module comprises a plurality of brainwave sensors, a signal amplification circuit and a signal following circuit, the solar photovoltaic conversion module comprises a solar photovoltaic cell panel, a DC/DC converting circuit, a charging protection circuit, a storage battery and a voltage level switching circuit. The sun helmet is novel in design and simple in structure, has the function of switching the music according to the practical brainwaves of a user, and is charged by the solar energy, thus being clean without pollution, and being easy to operate and strong in practicability.