The invention provides a high-voltage interlocking circuit of a solar cell system. The high-voltage interlocking circuit is characterized by comprising a solar cell, a storage battery, a vehicle control unit, a power battery and a connector loop, wherein the output end of the storage battery is electrically connected with the low-voltage input end of the solar cell through the connector loop; thesignal end of the vehicle control unit is electrically connected with the signal end of the solar cell through a CAN bus and the connector loop; the high-voltage output end of the solar cell is electrically connected with the high-voltage input end of the power battery through the connector loop. The high-voltage interlocking circuit of the solar cell system aims at overcoming the defects in the prior art, and the safety of a whole vehicle is effectively improved.