A laser control circuit, comprising at least two laser diodes (LD1, LD2) and a control unit controlling the at least two laser diodes respectively, wherein the control unit sends control signals to the at least two laser diodes to control startup/shutdown thereof, wherein the control unit comprises: a main pulse signal generator and a logic control unit, wherein the main pulse signal generator, the logic control unit and the at least two laser diodes are connected successively; the main pulse signal generator sends control signals to the logic control unit; and the logic control unit classifies the control signals into different types of control signals and sends to the at least two laser diodes, causing the at least two laser diodes to present different working conditions, wherein the logic control unit comprises a NOT gate; the at least two laser diodes include a first laser diode group and a second laser diode group; an output end of the main pulse signal generator is connected with an input end of the NOT gate and the first laser diode group so as to send a main control signal to the input end of the NOT gate and the first laser diode group; an output end of the NOT gate connected with the second laser diode group is configured for having the main control signal be inverted and having the first and second laser group startup/shutdown alternately; and the control unit further comprises: a first secondary pulse signal generator; a second secondary pulse signal generator; a first AND gate; a second AND gate, wherein the first secondary pulse signal generator is connected with a first input end of the first AND gate and sends a secondary pulse signal to the first AND gate, the second secondary pulse signal generator is connected with a first input end of the second AND gate and sends a secondary pulse signal to the second AND gate, a second input end of the first AND gate is connected with the main pulse signal generator, while an output end of the first AND gate is connected with each laser diode of the fist laser diode group; and a second input end of the second AND gate is connected with the output end of the NOT gate so that the main pulse signal generator and the secondary pulse signal generators control the startup/shutdown of each laser diode, while an output end of the second AND gate is connected with each laser diode of the second laser diode group. a main pulse signal generator and a logic control unit, wherein the main pulse signal generator, the logic control unit and the at least two laser diodes are connected successively; the main pulse signal generator sends control signals to the logic control unit; and the logic control unit classifies the control signals into different types of control signals and sends to the at least two laser diodes, causing the at least two laser diodes to present different working conditions, wherein the logic control unit comprises a NOT gate; the at least two laser diodes include a first laser diode group and a second laser diode group; an output end of the main pulse signal generator is connected with an input end of the NOT gate and the first laser diode group so as to send a main control signal to the input end of the NOT gate and the first laser diode group; an output end of the NOT gate connected with the second laser diode group is configured for having the main control signal be inverted and having the first and second laser group startup/shutdown alternately; and the control unit further comprises: a first secondary pulse signal generator; a second secondary pulse signal generator; a first AND gate; a second AND gate, wherein the first secondary pulse signal generator is connected with a first input end of the first AND gate and sends a secondary pulse signal to the first AND gate, the second secondary pulse signal generator is connected with a first input end of the second AND gate and sends a secondary pulse signal to the second AND gate, a first secondary pulse signal generator; a second secondary pulse signal generator; a first AND gate; a second AND gate, wherein the first secondary pulse signal generator is connected with a first input end of the first AND gate and sends a secondary pulse signal to the first AND gate, the second secondary pulse signal generator is connected with a first input end of the second AND gate and sends a secondary pulse signal to the second AND gate, a second input end of the first AND gate is connected with the main pulse signal generator, while an output end of the first AND gate is connected with each laser diode of the fist laser diode group; and a second input end of the second AND gate is connected with the output end of the NOT gate so that the main pulse signal generator and the secondary pulse signal generators control the startup/shutdown of each laser diode, while an output end of the second AND gate is connected with each laser diode of the second laser diode group.