How many lines does alliteration poem have?

There's no set number of lines for an alliteration poem! Alliteration is a literary device, not a specific form of poetry.

Here's what makes alliteration:

* Repetition of consonant sounds at the beginning of words. This can happen in a single line, a whole stanza, or throughout an entire poem.

Examples:

* One line: "Peter Piper picked a peck of pickled peppers."

* Several lines:

"The whispering willows weep

With weary, windblown leaves."

* A whole poem: "The Raven" by Edgar Allan Poe uses alliteration throughout, but the poem has many lines.

So, the number of lines in an alliteration poem depends entirely on the poet's intention and the poem's overall structure.