A power tool, comprising: a housing; a motor disposed in the housing; a power output member configured to output power, wherein the power output member extends substantially along an axis and is connected with an operating accessory, the operating accessory is provided with a working portion, and the axis extends substantially along a front-and-rear direction; a transmission assembly configured to transmit power of the motor to the power output member; and a light source device configured to illuminate the working portion of the power tool or a working area, wherein the light source device comprises: a light guide plate formed with a light exit surface for emitting light and a first light incident surface and a second light incident surface for guiding light into the light guide plate, wherein the light guide plate surrounds the power output member; a light-emitting element emitting the light toward the first light incident surface and the second incident surface; and a circuit board for installing the light-emitting element; characterized in that a maximum distance L between the first light incident surface and the second light incident surface is greater than or equal to 0 mm and less than or equal to 7 mm; the circuit board extends substantially along a first straight line, the first straight line is substantially perpendicular to the axis, and the first straight line is substantially perpendicular to a plane where the light exit surface is located; in a direction perpendicular to the first straight line, the circuit board comprises a first mounting surface and a second mounting surface that are oppositely disposed, and the light-emitting element is installed on each of the first mounting surface and the second mounting surface; and the light-emitting element comprises a first light-emitting element and a second light-emitting element, and a distance D between the first light-emitting element and the second light-emitting element along the direction perpendicular to the first straight line is greater than or equal to 0.5 mm and less than or equal to 7 mm. a housing; a motor disposed in the housing; a power output member configured to output power, wherein the power output member extends substantially along an axis and is connected with an operating accessory, the operating accessory is provided with a working portion, and the axis extends substantially along a front-and-rear direction; a transmission assembly configured to transmit power of the motor to the power output member; and a light source device configured to illuminate the working portion of the power tool or a working area, wherein the light source device comprises: a light guide plate formed with a light exit surface for emitting light and a first light incident surface and a second light incident surface for guiding light into the light guide plate, wherein the light guide plate surrounds the power output member; a light-emitting element emitting the light toward the first light incident surface and the second incident surface; and a circuit board for installing the light-emitting element; characterized in that a maximum distance L between the first light incident surface and the second light incident surface is greater than or equal to 0 mm and less than or equal to 7 mm; the circuit board extends substantially along a first straight line, the first straight line is substantially perpendicular to the axis, and the first straight line is substantially perpendicular to a plane where the light exit surface is located; in a direction perpendicular to the first straight line, the circuit board comprises a first mounting surface and a second mounting surface that are oppositely disposed, and the light-emitting element is installed on each of the first mounting surface and the second mounting surface; and the light-emitting element comprises a first light-emitting element and a second light-emitting element, and a distance D between the first light-emitting element and the second light-emitting element along the direction perpendicular to the first straight line is greater than or equal to 0.5 mm and less than or equal to 7 mm. a light guide plate formed with a light exit surface for emitting light and a first light incident surface and a second light incident surface for guiding light into the light guide plate, wherein the light guide plate surrounds the power output member; a light-emitting element emitting the light toward the first light incident surface and the second incident surface; and a circuit board for installing the light-emitting element; characterized in that a maximum distance L between the first light incident surface and the second light incident surface is greater than or equal to 0 mm and less than or equal to 7 mm; the circuit board extends substantially along a first straight line, the first straight line is substantially perpendicular to the axis, and the first straight line is substantially perpendicular to a plane where the light exit surface is located; in a direction perpendicular to the first straight line, the circuit board comprises a first mounting surface and a second mounting surface that are oppositely disposed, and the light-emitting element is installed on each of the first mounting surface and the second mounting surface; and the light-emitting element comprises a first light-emitting element and a second light-emitting element, and a distance D between the first light-emitting element and the second light-emitting element along the direction perpendicular to the first straight line is greater than or equal to 0.5 mm and less than or equal to 7 mm.