The invention discloses a welding bolt for a conical disc head and a manufacturing process thereof. The welding bolt for the conical plate head comprises a rod body, wherein a planar circular disc face is arranged at one end of the rod body; a trapezoidal circular disc face is arranged at one end, away from the rod body, of the planar circular disc face; a conical circular disc face is arranged atone end, away from the planar circular disc face, of the trapezoidal circular disc face; screw threads and circular threads, which are in circular spiral shapes, are sequentially arranged on the rodbody from left to right; a second drilling and locking part is arranged at the other end of the rod body; a first drilling and locking part is arranged at one end, away from the rod body, of the second drilling and locking part; and a sunken area is arranged in the center of one end, away from the second drilling and locking part, of the first drilling and locking part. The welding bolt for the conical disc head can bear larger twisting torque, is high in connection strength, and is relatively higher in fastening force; moreover, connection between parts is facilitated, the structure is compact, breakage of the bolt is prevented, and the service life of the welding bolt is prolonged; and through application of a rust-proof device and an anti-rust agent, the bolt is conveniently soaked to prevent rust, and is convenient to use.