A fixing apparatus, comprising: a first fixing device adapted to position and fix at least one first elongated element; and a second fixing device adapted to position and fix at least one second elongated element, wherein the first fixing device is formed with at least one first positioning groove adapted to position the first elongated element, and the second fixing device is formed with at least one second positioning groove adapted to position the second elongated element; and each first positioning groove is aligned with a corresponding second positioning groove, so that the first elongated element fixed in the first positioning groove is axially aligned with the second elongated element fixed in the corresponding second positioning groove, and wherein the first fixing device comprises: a first fixing base in which the first positioning groove is formed; a first pressing cover pivotally connected to a side of the first fixing base and adapted to be rotatable between an open state and a closed state, wherein the first fixing device further comprises a lock pivotally connected to the other side of the first fixing base and adapted to be rotatable between a locked position and an unlocked position, wherein the first pressing cover is adapted to hold the first elongated element into the first positioning groove when being in the closed state; wherein the lock is adapted to lock the first pressing cover in the closed state when being in the locked position, wherein the lock has a connection portion pivotally connected to the first fixing base between the upper end and a lower end thereof, and wherein the first fixing base is formed with a spring receiving chamber in which a first spring is disposed; and the first spring is pressed against the lower end of the lock at one end thereof to hold the lock in the lock position. a first fixing device adapted to position and fix at least one first elongated element; and a second fixing device adapted to position and fix at least one second elongated element, wherein the first fixing device is formed with at least one first positioning groove adapted to position the first elongated element, and the second fixing device is formed with at least one second positioning groove adapted to position the second elongated element; and each first positioning groove is aligned with a corresponding second positioning groove, so that the first elongated element fixed in the first positioning groove is axially aligned with the second elongated element fixed in the corresponding second positioning groove, and wherein the first fixing device comprises: a first fixing base in which the first positioning groove is formed; a first pressing cover pivotally connected to a side of the first fixing base and adapted to be rotatable between an open state and a closed state, wherein the first fixing device further comprises a lock pivotally connected to the other side of the first fixing base and adapted to be rotatable between a locked position and an unlocked position, wherein the first pressing cover is adapted to hold the first elongated element into the first positioning groove when being in the closed state; wherein the lock is adapted to lock the first pressing cover in the closed state when being in the locked position, wherein the lock has a connection portion pivotally connected to the first fixing base between the upper end and a lower end thereof, and wherein the first fixing base is formed with a spring receiving chamber in which a first spring is disposed; and the first spring is pressed against the lower end of the lock at one end thereof to hold the lock in the lock position. a first fixing base in which the first positioning groove is formed; a first pressing cover pivotally connected to a side of the first fixing base and adapted to be rotatable between an open state and a closed state, wherein the first fixing device further comprises a lock pivotally connected to the other side of the first fixing base and adapted to be rotatable between a locked position and an unlocked position, wherein the first pressing cover is adapted to hold the first elongated element into the first positioning groove when being in the closed state; wherein the lock is adapted to lock the first pressing cover in the closed state when being in the locked position, wherein the lock has a connection portion pivotally connected to the first fixing base between the upper end and a lower end thereof, and wherein the first fixing base is formed with a spring receiving chamber in which a first spring is disposed; and the first spring is pressed against the lower end of the lock at one end thereof to hold the lock in the lock position.