The invention discloses a horizontal well logging tappet rod, and belongs to the technical field of oil field horizontal well logging. An upper connecting body, a main body and a lower connecting body are welded to form a rod body of the tappet rod; an internal thread and a sealing surface are arranged at the upper end of the tappet rod, and an external screw and a sealing groove are arranged at the lower end; the connection and the sealing between the tappet rods and between the tappet rods and instrument tools are realized through threads and O-shaped rings; a cable plug assembly is arranged at the upper end of the tappet rod, a cable socket assembly is arranged at the lower end, and the two are connected by a cable; the circuit connection and the signal transmission between the tappet rods and between the tappet rods and the instrument tools are realized through the cable plug assembly and the cable socket assembly; and an annular groove is formed in the outer wall of the tappet rod as a bayonet for lifting a rod elevator of the tappet rod in the scene well descending operation. The horizontal well logging tappet rod has the following effects: the tappet rod serves as a tool for instrument transmission and signal transmission in horizontal well logging, is excellent in rigidity and toughness, resists high temperature and high pressure, can realize the cable descending through a hollow pump, and is simple in structure and convenient for use.