The invention relates to the technical field of SCV combustor control, in particular to a control method for regulating fuel supply of an SCV combustor. The control method includes the following steps: 1, detecting LNG flow through an LNG flowmeter, inputting the LNG flow to a PLC which uses the LNG flow as an input value X, and calculating an opening value of a natural gas regulation valve through a formula Y1=aX+b, wherein the formula Y1=aX+b is obtained by that in a field test, the LNG flows with different loads are corresponding to different opening values of the natural regulation valve to form discrete point data, and then the discrete point data are connected into a curve, and a linear formula Y1=aX+b closest to the curve is searched through calculation. The control method can allow the SCV combustor to rapidly find an optimum output point according to change of the LNG loads, ensures a constant NG temperature, and allows the SCV to run stably, safely and reliably.