The invention discloses a linear driving method capable of reducing ripples. Through inputting current to a microprocessor via a port, time for two zero-crossing points is detected, the power grid frequency is calculated, a formula Uu=Um*sin(omegat+phi) is used, a phase angle is inversely calculated according to circuit needed voltage, and thus, signals are sent to a switch transistor Q1, a switch transistor Q2, a switch transistor Q3 and a switch transistor Q4 at the circuit needed voltage point. Through detecting the angle of a sine wave, the microprocessor controls an led in the lowest section to output large current in the case of small angle, current of leds of different sections is controlled along with increasing of the sine wave angle, the current is decreased gradually, the led current is gradually reduced along with increasing of the sine wave angle, an obvious illumination jump phenomenon during a section linear process is reduced, and through a method of increasing the output current in a low voltage section and reducing the output current in a high voltage section, the output ripples are reduced, a PF value can be effectively improved during a process of realizing the function, and power grid line loss can be reduced.