A cable fixing assembly, said cable fixing assembly comprising a cable and a fixing board, said cable comprising a cable body and a cable head disposed on an end of said cable body, said cable fixing assembly characterized that: said cable head comprising: a stress release portion, a first end of said stress release portion being connected to said end of said cable body, a joint portion, a first end of said joint portion being disposed on an end surface of a second end of said stress release portion, and a lock body disposed on two opposite side surfaces of a second end of said joint portion and extending from said second end of said joint portion, wherein said lock body is annular sector shaped, a restriction groove is formed between said lock body and said stress release portion; a terminal portion disposed on an end surface of said second end of said joint portion, a through hole is formed through said terminal portion, said joint portion and said stress release portion; stranded wires of the cable exposed outside said cable head through said through hole; said fixing board comprising: a joint hole formed through said fixing board, a shape of said joint hole matching an entire shape of said joint portion and said lock body, at least one no-return block formed on said fixing board and adjacent to said joint hole, wherein said at least one no-return block comprises a guiding slope and a no-return surface, and a plurality of hooks disposed left-right staggeredly on said fixing board to fix conductive stranded wires of said cable; wherein said joint portion and said lock body are inserted into said joint hole and are rotated by an angle, and said lock body moves on said guiding slope and is locked by said no-return surface; and a case to receive said fixing board, said case comprises a through hole formed through a side wall of said case to render said cable body to pass through said through hole. said cable head comprising: a stress release portion, a first end of said stress release portion being connected to said end of said cable body, a joint portion, a first end of said joint portion being disposed on an end surface of a second end of said stress release portion, and a lock body disposed on two opposite side surfaces of a second end of said joint portion and extending from said second end of said joint portion, wherein said lock body is annular sector shaped, a restriction groove is formed between said lock body and said stress release portion; a terminal portion disposed on an end surface of said second end of said joint portion, a through hole is formed through said terminal portion, said joint portion and said stress release portion; a stress release portion, a first end of said stress release portion being connected to said end of said cable body, a joint portion, a first end of said joint portion being disposed on an end surface of a second end of said stress release portion, and a lock body disposed on two opposite side surfaces of a second end of said joint portion and extending from said second end of said joint portion, wherein said lock body is annular sector shaped, a restriction groove is formed between said lock body and said stress release portion; a terminal portion disposed on an end surface of said second end of said joint portion, a through hole is formed through said terminal portion, said joint portion and said stress release portion; stranded wires of the cable exposed outside said cable head through said through hole; said fixing board comprising: a joint hole formed through said fixing board, a shape of said joint hole matching an entire shape of said joint portion and said lock body, at least one no-return block formed on said fixing board and adjacent to said joint hole, wherein said at least one no-return block comprises a guiding slope and a no-return surface, and a plurality of hooks disposed left-right staggeredly on said fixing board to fix conductive stranded wires of said cable; a joint hole formed through said fixing board, a shape of said joint hole matching an entire shape of said joint portion and said lock body, at least one no-return block formed on said fixing board and adjacent to said joint hole, wherein said at least one no-return block comprises a guiding slope and a no-return surface, and a plurality of hooks disposed left-right staggeredly on said fixing board to fix conductive stranded wires of said cable; wherein said joint portion and said lock body are inserted into said joint hole and are rotated by an angle, and said lock body moves on said guiding slope and is locked by said no-return surface; and a case to receive said fixing board, said case comprises a through hole formed through a side wall of said case to render said cable body to pass through said through hole.