A filter holder, characterized in that the filter holder comprises: an assembling base including: a mounting portion configured to be fixed to a bracket; and a body holder having: a connecting hole transversally formed through the body holder; a slit transversally formed through the body holder, formed through an external surface and an internal surface of the body holder, and communicating with the connecting hole and an outside of the body holder; a blocking end located at a side of the slit; and an engaging groove recessed in the body holder, communicating with the connecting hole, and spaced apart from the slit at an angular interval; a trigger component connected to the body holder of the assembling base and being adjacent to the blocking end; and a body rotatably connected to the assembling base and including: a cap configured to be connected to a filter cartridge; a connecting tube formed at a top of the cap and inserted into the connecting hole of the body holder; and a locking rib protruding from an external peripheral surface of the connecting tube; wherein the body has an initial position and a locking position; when the body is in the initial position, the locking rib of the body is located in the slit of the body holder of the assembling base; when the body is in the locking position, the locking rib is located in and engaged with the engaging groove of the body holder of the assembling base; the trigger component is configured to be pressed away from the slit to drive the body holder for releasing an engagement between the engaging groove of the body holder and the locking rib of the body. an assembling base including: a mounting portion configured to be fixed to a bracket; and a body holder having: a connecting hole transversally formed through the body holder; a slit transversally formed through the body holder, formed through an external surface and an internal surface of the body holder, and communicating with the connecting hole and an outside of the body holder; a blocking end located at a side of the slit; and an engaging groove recessed in the body holder, communicating with the connecting hole, and spaced apart from the slit at an angular interval; a mounting portion configured to be fixed to a bracket; and a body holder having: a connecting hole transversally formed through the body holder; a slit transversally formed through the body holder, formed through an external surface and an internal surface of the body holder, and communicating with the connecting hole and an outside of the body holder; a blocking end located at a side of the slit; and an engaging groove recessed in the body holder, communicating with the connecting hole, and spaced apart from the slit at an angular interval; a connecting hole transversally formed through the body holder; a slit transversally formed through the body holder, formed through an external surface and an internal surface of the body holder, and communicating with the connecting hole and an outside of the body holder; a blocking end located at a side of the slit; and an engaging groove recessed in the body holder, communicating with the connecting hole, and spaced apart from the slit at an angular interval; a trigger component connected to the body holder of the assembling base and being adjacent to the blocking end; and a body rotatably connected to the assembling base and including: a cap configured to be connected to a filter cartridge; a connecting tube formed at a top of the cap and inserted into the connecting hole of the body holder; and a locking rib protruding from an external peripheral surface of the connecting tube; wherein a cap configured to be connected to a filter cartridge; a connecting tube formed at a top of the cap and inserted into the connecting hole of the body holder; and a locking rib protruding from an external peripheral surface of the connecting tube; wherein the body has an initial position and a locking position; when the body is in the initial position, the locking rib of the body is located in the slit of the body holder of the assembling base; when the body is in the locking position, the locking rib is located in and engaged with the engaging groove of the body holder of the assembling base; the trigger component is configured to be pressed away from the slit to drive the body holder for releasing an engagement between the engaging groove of the body holder and the locking rib of the body.