The invention belongs to the technical field of oil and gas field continuous tube drilling, and particularly provides an implantable type small wellbore continuous tube drilling method. The implantable type small wellbore continuous tube drilling method comprises the following steps of (1) carrying out first drilling, and putting a general large-diameter sleeve into a wellbore for well cementation after the first drilling is completed; (2) arranging a wellhead blowout preventor unit on a wellhead; (3) carrying out second drilling, drilling to a reserved well depth and taking out a drill bit; (4) putting a sealing nipple to the inner side of the bottom part of the large-diameter sleeve; (5) arranging a hanging nipple on the wellhead, putting a small-diameter sleeve into the wellbore and enabling the bottom part of the small-diameter sleeve to be located at the inner wall of the sealing nipple in an adhesion sealing way and the upper part of the small-diameter sleeve to be hung on the hanging nipple; (6) putting a continuous tube into the small-diameter sleeve and carrying out a continuous tube drilling test; (7) pulling the small-diameter sleeve out of the wellhead by using a lifting nipple after the continuous tube drilling test is completed. According to the implantable type small wellbore continuous tube drilling method provided by the invention, a drilling fluid annular velocity is increased, and sand settling and drill clamping are avoided; the small-diameter sleeve can be pulled out from the wellhead after the continuous tube drilling test is completed and can be reused, and the cost is reduced.