The invention relates to the technical field of meteorological observation equipment. The problems that the mounting efficiency of an anemometer tower is low, and mounting workers face dangerous mounting environments when mounting the anemometer tower on an off-shore platform are solved. An extending type anemometer tower comprises at least three tower bodies which are the bottom-layer tower body, the middle-layer tower body and the top-layer tower body correspondingly. The bottom-layer tower body and the middle-layer tower body are each of a triquetral-table truss structure, and the top-layer tower body is of a triangular-pyramid truss structure. The middle-layer tower body is arranged in the bottom-layer tower, and the top-layer tower is arranged in the muddle-layer tower. The extending type anemometer tower further comprises a pulley device and a fixing device, the pulley device comprises a first pulley set, a second pulley set, a third pulley set and a cable set, and the fixing device comprises a first fixing piece and a second fixing piece.