Aiming at 895 nm VCSEL laser of Vxar company,a voltage controlled constant current source circuit with simple circuit structure and high stability is proposed.This circuit uses an ingenious constant current source circuit in parallel with a common voltage controlled micro current source circuit,which enables low cost,small volume and low power consumption on the basis of ensuring high stability and certain accuracy.Experimental results show that the stability of constant current source is better than 10-6A(Max-Ipp is 0.35 μA),the current is continuously adjustable by step,the circuit area is 4.5 cm×4.5 cm,the maximum power consumption is 468 mW,which can well meet the control requirements of small laser pumped atomic magnetometer for the laser.