In view of the disadvantages of DC/DC boost converter in new energy generation system，such as low output voltage and large peak voltage of switch tube，a boost converter based on coupling inductor and voltage multiplier capacitor is proposed.The coupling inductor and two voltage doubling capacitors are introduced into the converter to improve the voltage gain，reduce the voltage stress of the switch tube and the loss of the converter，suppress the voltage spike of the switch tube，realize the zero current turnon of the switch tube，and solve the reverse recovery problem of the output diode by the leakage inductance of the secondary winding of the coupling inductor.Matlab is used to simulate the proposed converter，analyze the steady state of the converter，and get the efficiency of the converter under different output power.