The invention relates to a semicircular spliced LED (Light-Emitting Diode) lamp bulb provided with an embedded driver. A positioning hole is formed in a substrate of a PCB (Printed Circuit Board) driving assembly; an insulating shell consisting of two semicircular shells is sleeved outside the PCB driving assembly; the inner walls of the semicircular shells of the insulating shell are provided with positioning columns respectively; the positioning columns are inserted into the positioning hole; the lower part of the insulating shell is connected with a lamp cap; the upper part of the insulating shell is connected with the shell; a fastening sleeve is sleeved between the upper part of the insulating shell and the shell; both sides of the PCB driving assembly are provided with two groups of joints; the two groups of joints on the upper side are inserted into the top of the insulating shell, and are welded with a light source substrate; and two groups of joints on the lower side are connected with lamp cap. Due to the adoption of the semicircular spliced LED lamp bulb, leads for electrically connecting the PCB driving assembly, the lamp cap and an LED light source board are eliminated fully, the efficiency is increased greatly, and unnecessary waste of materials and work hours is reduced.