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

An anti-theft fixing device and an anti-theft vehicle roof rack crossbar are provided. The anti-theft fixing device includes a fixing main body, an anti-theft body, a cover body, and a lock member. The fixing main body includes a fixing portion and a connecting portion, the fixing portion is fixedly connected to the connecting portion, the fixing portion includes at least one fixing hole. The connecting portion further includes a mounting hole, and the connecting portion further includes a first surface and a second surface opposite to the first surface. The anti-theft body includes an anti-theft portion disposed on an inner surface thereof and mounted onto the mounting hole so that the anti-theft portion detachably connected to the first surface of the connecting portion to cover the at least one fixing hole.