A multi-channel working cannula, comprising main catheter and a plurality of accessory catheters, 2. wherein: the distance between the main catheter and the accessory catheters is adjustable; one end of the main catheter is provided with a guide plate, and the other end is an insertion end, and the guide plate extends in a direction perpendicular to the length of the main catheter; the guide plate is provided with a first through hole, and the main catheter is inserted into the first through hole; the guide plate is provided with at least one elongated hole, and in case there is more than one elongated hole, the elongated holes are at intervals distributed along the plane on which the guide plate is located; one end of the accessory catheter is provided with a mounting block, the length of the mounting block is less than that of the elongated hole, and the mounting block is inserted into the corresponding elongated hole; the mounting block is provided with a second through hole, and the accessory catheter is inserted into the second through hole; characterized in that: the side of the mounting block is provided with a locking hole, the locking hole is communicated with the second through hole; it also includes a first locking member; the first locking member is inserted into the locking hole, and the accessory catheter is fixedly connected to the mounting block, wherein the guide plate is provided with positioning holes, and the positioning hole are at intervals distributed along both sides of the elongated hole; the mounting block is provided with fixing holes; it also includes a second locking member; the second locking member is inserted into the fixing hole and the corresponding positioning hole to fix the mounting block on the guide plate. the distance between the main catheter and the accessory catheters is adjustable; one end of the main catheter is provided with a guide plate, and the other end is an insertion end, and the guide plate extends in a direction perpendicular to the length of the main catheter; the guide plate is provided with a first through hole, and the main catheter is inserted into the first through hole; the guide plate is provided with at least one elongated hole, and in case there is more than one elongated hole, the elongated holes are at intervals distributed along the plane on which the guide plate is located; one end of the accessory catheter is provided with a mounting block, the length of the mounting block is less than that of the elongated hole, and the mounting block is inserted into the corresponding elongated hole; the mounting block is provided with a second through hole, and the accessory catheter is inserted into the second through hole; characterized in that: the side of the mounting block is provided with a locking hole, the locking hole is communicated with the second through hole; it also includes a first locking member; the first locking member is inserted into the locking hole, and the accessory catheter is fixedly connected to the mounting block, wherein the guide plate is provided with positioning holes, and the positioning hole are at intervals distributed along both sides of the elongated hole; the mounting block is provided with fixing holes; it also includes a second locking member; the second locking member is inserted into the fixing hole and the corresponding positioning hole to fix the mounting block on the guide plate. the side of the mounting block is provided with a locking hole, the locking hole is communicated with the second through hole; it also includes a first locking member; the first locking member is inserted into the locking hole, and the accessory catheter is fixedly connected to the mounting block, wherein the guide plate is provided with positioning holes, and the positioning hole are at intervals distributed along both sides of the elongated hole; the mounting block is provided with fixing holes; it also includes a second locking member; the second locking member is inserted into the fixing hole and the corresponding positioning hole to fix the mounting block on the guide plate.