The utility model belongs to the technical field of coiled tubing drilling for petroleum and natural gas exploration and development. The slim hole circumferential impact generating device for coiledtubing drilling comprises a slim hole, the device is characterized by comprising a lower joint, the combined hammer body is sleeved in an inner hole of the lower joint; wherein the upper connector isconnected outside the combined hammer body in a sleeved mode and connected with the lower connector in a sliding mode, the hanging body is connected with the lower connector and the upper connector, and the combined hammer body comprises a screen pipe, an auxiliary hammer arranged outside the screen pipe in a sleeved mode, a main hammer arranged outside the auxiliary hammer in a sleeved mode and aflow guide cap arranged outside the screen pipe in a sleeved mode and limiting axial movement of the auxiliary hammer and the main hammer. The durability of the drill bit is improved, the service life of the drill bit is prolonged, the reliability of the whole coiled tubing is improved, harm caused by stick slip is eliminated, torsion oscillation on a tubular column of the coiled tubing is reduced, and recoil torsion is reduced.