A vacuum-molded and reusable limb protecting pad (A) comprising: an airtight bag body made of air impermeable material, wherein a peripheral edge of the airtight bag body is sealed in an airtight manner to form a first containing space ; an outer surface of the airtight bag body being provided with an opening at a position corresponding to the first containing space , wherein the opening is in communication with the first containing space ; wherein a plurality of locating components are provided between two inner surfaces of the airtight bag body to divide the first containing space into a plurality of locating spaces ; a nozzle airtight sealed to the airtight bag body in a position corresponding to the opening and provided with an air channel through which an air extractor is able to pump air out of the first containing space ; a plurality of granules filled into the plurality of locating spaces ; a filter screen arranged at a position corresponding to the air channel , wherein the sieve size of the filter screen is less than particle size of the granules ; and at least one tightening component capable of enabling the limb protecting pad (A) to be wrapped around and abutted against a surface of a limb, so as to adjust tightness of the limb protecting pad (A) around the limb (B); characterized in that each of the plurality of locating components is formed by a positioning line having a specified length and being provided on two separated inner surfaces of the airtight bag body to divide the first containing space into a plurality of locating spaces which are spaced from but in communication with one another, so that a cross section of the first containing space is always maintained in a predetermined flat narrow shape. an airtight bag body made of air impermeable material, wherein a peripheral edge of the airtight bag body is sealed in an airtight manner to form a first containing space ; an outer surface of the airtight bag body being provided with an opening at a position corresponding to the first containing space , wherein the opening is in communication with the first containing space ; wherein a plurality of locating components are provided between two inner surfaces of the airtight bag body to divide the first containing space into a plurality of locating spaces ; a nozzle airtight sealed to the airtight bag body in a position corresponding to the opening and provided with an air channel through which an air extractor is able to pump air out of the first containing space ; a plurality of granules filled into the plurality of locating spaces ; a filter screen arranged at a position corresponding to the air channel , wherein the sieve size of the filter screen is less than particle size of the granules ; and at least one tightening component capable of enabling the limb protecting pad (A) to be wrapped around and abutted against a surface of a limb, so as to adjust tightness of the limb protecting pad (A) around the limb (B); characterized in that each of the plurality of locating components is formed by a positioning line having a specified length and being provided on two separated inner surfaces of the airtight bag body to divide the first containing space into a plurality of locating spaces which are spaced from but in communication with one another, so that a cross section of the first containing space is always maintained in a predetermined flat narrow shape. <EOS>