The present invention relates to a wood treatment device (1) for treating wood, and to a method for treating wood. Said wood treatment device (1) comprises a cylindrical hollow body (2) having inner end which is inside the wood when in use, and an outer end facing away from the inner end and at least one outlet opening (4). The cylindrical hollow body (2) comprises a receiving space (20′) which is designed to receive a carrier material (20) containing a wood treatment agent. Said wood treatment device (1) also comprises a thrust pin (10) which extends along the longitudinal axis of the cylindrical hollow body (2), and which can be moved outside of the cylindrical hollow body (2) on the outer end. Said thrust pin (10) comprises at least one closure section (11, 12) which closes at least one outlet opening when the wood treatment device (1) is not in use, and when the wood treatment device (1) is in use, the at least one outlet opening is released after moving and the receiving chamber is brought into contact with the wood.