Aniline hydrochloride

So the liquid become powder sir?

Aniline is a liquid at room temperature. If you add one equivalent of HCl to it, yes, it becomes a white powder.

Sometimes people write acid salts different ways that can be confusing.

Aniline hcl is an acid salt? Salt that is acidic?

I have not done this exact experiment, but I have done things that are similar.  Imagine a solution of aniline in diethyl ether, and a solution of HCl in diethyl ether.  Now imagine mixing them.  HCl will protonate aniline to create a salt that is insoluble, meaning that it will fall out of the organic solvent.  We collect the crystals of this salt using filtration.  The crystalline material could be written as C₆H₅NH₂•HCl, although this notation might mislead the unwary.  One could also write C₆H₅NH₃⁺Cl^-.

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So the liquid become powder sir?

Every liquid may solidify under a sufficiently lower temperature. But in this case, a new compound is formed with new physical properties.
From dry gases: NH₃ and HCl you will obtain a solid NH₄Cl.

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aniline hydrochloride is a green or white sand-like powder. Does it mean aniline powder mixed with hcl powder? Because i saw aniline and hcl not connected

What is HCl powder. HCl is a gas , what is available as hydrochloric acid as aquaeous solution.