The invention relates to a wrench capable of adjusting head angles in a narrow space. The wrench capable of adjusting the head angles in the narrow space comprises a wrench head, operation handles and a locking screw rod, wherein the wrench head is movably connected with the operation handles, each operation handle is of a hollow cylindrical structure, an internal thread is arranged on the inner wall of the upper portion of each operation handle, a hemisphere is arranged at the top of the locking screw rod, an external thread is arranged on the upper portion of the locking screw rod and below the hemisphere, the external thread is matched with the internal threads on the operation handles, and the locking screw rod is connected with the operation handles in threaded mode. The wrench capable of adjusting the head angles in the narrow space can replace different wrench heads according to use conditions, and is flexible and convenient to use, wide in application range, and suitable for various devices. According to the wrench capable of adjusting the head angles in the narrow space, the operation handles are of a combination type, the adjacent operation handles are connected in threaded mode, and the length of the operation handles can be adjusted according to the use conditions.