Anti-theft fixing device and anti-theft vehicle roof rack crossbar

An anti-theft fixing device, comprising:

• a fixing main body comprising a fixing portion, the fixing portion defining at least one fixing hole;
• and
• an anti-theft assembly detachably connected to the fixing main body and comprising an anti-theft body;
• wherein the at least one fixing hole is configured to receive a fastening member to secure the fixing main body to a mounting surface of a vehicle roof;
• the fixing portion has an inner surface and an outer surface opposite to the inner surface;
• each fixing hole extends through the fixing portion and defines an inner opening on the inner surface and an outer opening on the outer surface;
• the anti-theft body is configured to cover the inner opening when the anti-theft body is connected to the fixing main body so as to prevent access to the fastening member from the inner surface;
• and the outer surface is configured to be fixed to the mounting surface of the vehicle roof.