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I bought a portable stove for my travel but it broke and I tried to open it. But one of the screw looks like this. I have no idea if the manufacture put a abnormal screw. How do I unscrew this?

enter image description here

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    while it is a travel stove, you may find more support on The Great Outdoors, where more users use travel stoves while camping, hiking, etc or Home Improvement which covers screwdrivers and such. Sep 17 '19 at 0:49
  • I'm voting to close this question as off-topic because this is about a screwdriver, not about travel.
    – Willeke
    Sep 17 '19 at 3:14
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    You can also sometimes use a snake eyes bit, or get a cheap flat blade screwdriver and file a slot in it with a needle file (better screwdrivers are too hard to file, hence the cheap one) Sep 17 '19 at 6:32
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This appears to be a "H-Type (notched spanner)" screw from the description below (second row from the top, second column from the right):

enter image description here

You will need a H-type screw driver:

enter image description here

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It's a fairly common form of "tamper proof" head, you need a bit that looks like a regular flat blade but with a slot in the middle. I think it's sometimes called a "spanner head". In my experience most "security bit sets" contain that style of bit in a variety of sizes.

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