The invention discloses a controllable source while drilling neutron porosity logger environment correction method. The controllable source while drilling neutron porosity logger environment correction method comprises the steps that clearance area dividing scale is carried out, independent scale curves are arranged in each clearance area, and a bin area where a borehole clearance belongs is determined; a controllable source while drilling neutron porosity logger is in a cycle T, time of located in a some clearance area is longer, time weight of visible porosity of the controllable source while drilling neutron porosity logger in the clearance area is greater, and the reliability is higher; and in a cycle T, a visible porosity value of one side of an axis of the controllable source while drilling neutron porosity logger is obtained through borehole weighing and time weighing, a measurement value of the controllable source while drilling neutron porosity logger is obtained by processingthe visible porosity of the two sides of the axis of the controllable source while drilling neutron porosity logger through the time weighing, and finally controllable source while drilling neutron porosity logger environment correction is completed. According to the controllable source while drilling neutron porosity logger environment correction method, the influence of clearance unordered change and borehole size on the porosity logging curves can be eliminated.