The invention provides a method for making a pig feed by using straw biogas residues and a method for feeding an initial-stage pig by using the feed, belonging to the technical field of biogas utilization and solving the problems of poor appetite, anorexia, piddling, dietary bias and other phenomena of a pig in a feeding process because a feed made by using existing biogas residues is stranger for the pig. The method for making the pig feed by using the straw biogas residues comprises the following steps: A, selecting and preparing the biogas residues; B, exhausting a solution; C, drying; D, crushing; E, mixing the feed; F, forming particles; G, spraying plant protein powder. The method for feeding the initial-stage pig by using the feed made by adopting the method for making the pig feed by using the straw biogas residues comprises the following steps: A, preparing for feeding; B, initially feeding; C, detecting the safety. The method for making the pig feed is low in source cost, and perfect in formed feed. The method for feeding the initial-stage pig is high in effect taking speed, and capable of making the pig rapidly adapt to a new feed.