The invention belongs to the technical field of electric heating, and discloses a wellhead pipeline semiconductor heater. According to the wellhead pipeline semiconductor heater, the problems that deposition and blocking of existing pipelines occur, and the wellhead return pressure rises are effectively solved, and the power of the heater can be increased step by step. The wellhead pipeline semiconductor heater is particularly suitable for heating pipelines with low water content and small liquid production amount. The wellhead pipeline semiconductor heater comprises a four-rectangular-face shell (1) and is mainly characterized in that hollow metal pipes (2) of a certain size are embedded into the heater, and four inserted type semiconductor heating assemblies (3) are embedded into the chiseled hollow faces of the four-rectangular-face shell (1); and each inserted type semiconductor heating assembly (3) is composed of two resistance sheets (4) and semiconductor heating elements (5), wherein the two resistance sheets (4) are arranged up and down and provided with extraction electrodes (7), the semiconductor heating elements (5) are arranged in the two resistance sheets (4) in order, and the resistance sheets (4) and the semiconductor heating elements (5) are wrapped into a whole through a mica heat-resistant insulating film (6). The wellhead pipeline semiconductor heater has the characteristics of being reasonable in structure, good in heating effect, high in reliability and the like.