The invention provides a method for welding a capillary tube heat exchanger tube sheet and capillary tubes. The method for welding the capillary tube heat exchanger tube sheet and the capillary tubescomprises the following steps that 1, a tool is machined; 2, the stainless steel capillary tubes with high temperature resistant metal wires penetrating through the insidesarearranged according to requirements of a capillary tube heat exchanger and penetrate through small holes at the bottom of the tool; 3, metal is added into the tool; 4, the metal is melted; and5, the tool is removed, the metalwires are extracted, machining and assembling are further conducted, and overall manufacturing of the capillary tube heat exchanger is completed. The method for welding the capillary tube heat exchanger tube sheet and the capillary tubes has the advantages that it is ensured that the problem that the welding of the capillary tubes and the tube sheet of the capillary tube heat exchanger is difficult can be solved while an integrated tube sheet and capillary tube channel structure is obtained by melting solidification, and a microchannel required by the capillary tube heat exchanger is formed; and the cost can be effectively reduced, and the production efficiency is improved.