The top ten most poisonous jellyfish in the world are: hair jellyfish, Irukandji jellyfish, arctic jellyfish, noctilucent swimming jellyfish, man-of-war jellyfish, Australian square jellyfish, Australian box jellyfish, and spin hook hand. Jellyfish, marine wasps, sand jellyfish. Among them, the sand jellyfish is one of the largest jellyfish in the world, with a diameter of 2 meters and a weight of about 200 kilograms. It is usually attached to shells, rocks and other substrates. Its stinging cells are highly toxic. After being stung, the skin of the human body will be red, swollen, itchy, and severe. The patient goes into shock and even dies.

Man-of-war jellyfish: The tentacles of the man-of-war jellyfish are densely covered with tiny stinging cells. These stinging cells can secrete deadly toxins. Its toxins belong to the category of neurotoxins, and its tiny tentacles can reach 9 meters. After being stung, you will feel severe pain, which can be fatal in severe cases.

Australian square jellyfish: Australian square jellyfish is the most poisonous creature known to humans on earth. It mainly lives in the waters off the northeastern coast of Australia. Its tentacles have thousands of stinging cells that store venom. , one Australian square jellyfish has enough venom to poison 60 adults.

Irukandji jellyfish: Irukandji jellyfish is one of the most poisonous jellyfish in the world. Its petite body is only a few centimeters, but its body contains hundreds of times more poison than a cobra. One Jellyfish can be deadly and are mainly found in the waters of Australia's Great Barrier Reef.