A liquid collecting assembly includes a first structural member and a second structural member. The first structural member includes a first receiving portion and a first latching portion. The first receiving portion defines a first through slot. A first receiving groove is formed between the first latching portion and the first receiving portion. The second structural member defines a second through slot. The first structural member is slidably connected to the second structural member. The first receiving portion can accommodate in the second through slot, and the second structural member can accommodate in the first receiving groove.