The invention relates to a novel horizontal Christmas tree tubing hanger. The tubing hanger consists of a valve body, a valve seat, a valve stem and a seal ring. A main body is seated on the inner endsurface of a Christmas tree body through a shoulder portion, the outer diameter of the lower portion of the main body is connected to a calibration sleeve in a threaded mode to ensure accurate positioning of the tubing hanger in a lowering process, and the inner diameter of the lower portion of the main body is connected to hung oil tubes through connection threads. Threads in the inner diameterof the lower portion of the main body are subjected to downward pulling force caused by the gravity of all hung oil tubes, and trapezoidal threads are selected as the threads for connecting the tubinghanger body and the oil tubes. The lower portion of a locking block and the outer diameter of an expander are coated with gold ions in vacuum, this coating material greatly reduces the abrasion of acone and reduces the corrosion residue between the locking block and the expander, and a locking pin hole of an upper locking mandrel and a locking pin hole of the tubing hanger body are at the same level to ensure accurate installation and positioning of tools for lowering the tubing hanger.