A tower assembly system for a wind turbine, where the system comprises: - a first tower section having a first upper end connected to a first lower end facing away from the first upper end, wherein the first lower end comprises a first flange having multiple first holes configured to receive fastening means (25, 26) for mounting to a second tower section, and comprises a first contact surface for contacting a second contact surface on the second tower section; - the second tower section having a second upper end connected to a second lower end facing away from the second upper end, wherein the second upper end comprises the second contact surface and a second flange having multiple second holes configured to receive the fastening means (25, 26); and - at least one guidance device is configured to be coupled to one of the two ends (14, 15) of the tower sections (4, 5), wherein the guidance device comprises a guiding element connected to mounting means configured to be mounted to the flange (16, 21) of that tower section, which mounting means comprises a third contact surface for contacting a fourth contact surface on the flange facing away from the contact surface of that flange, and wherein the guiding element has a third end and a fourth end, where the third end extends out from the end of that tower section when the guidance device is mounted to the flange (16, 21) of that tower section, where the fourth end is connected to the third end and faces away from the third end, and wherein the fourth end comprises a plate having a fifth contact surface for contacting an inner surface of the tower section (4, 5) when mounted. - a first tower section having a first upper end connected to a first lower end facing away from the first upper end, wherein the first lower end comprises a first flange having multiple first holes configured to receive fastening means (25, 26) for mounting to a second tower section, and comprises a first contact surface for contacting a second contact surface on the second tower section; - the second tower section having a second upper end connected to a second lower end facing away from the second upper end, wherein the second upper end comprises the second contact surface and a second flange having multiple second holes configured to receive the fastening means (25, 26); and - at least one guidance device is configured to be coupled to one of the two ends (14, 15) of the tower sections (4, 5), wherein the guidance device comprises a guiding element connected to mounting means configured to be mounted to the flange (16, 21) of that tower section, which mounting means comprises a third contact surface for contacting a fourth contact surface on the flange facing away from the contact surface of that flange, and wherein the guiding element has a third end and a fourth end, where the third end extends out from the end of that tower section when the guidance device is mounted to the flange (16, 21) of that tower section, where the fourth end is connected to the third end and faces away from the third end, and wherein the fourth end comprises a plate having a fifth contact surface for contacting an inner surface of the tower section (4, 5) when mounted.