Preparing method for copper-chromium alloy

The invention discloses a preparing method for a copper-chromium alloy. The preparing method includes the following steps that 1, a copper-chromium intermediate alloy is prepared; 2, mixed powder A is prepared; 3, mixed powder B is prepared; 4, the copper-chromium intermediate alloy is added into a graphite crucible to be arranged in an induction furnace, and after heating smelting is carried out for 1 h to 2 h, the mixed powder A and the mixed power B are sequentially added and stirred; 5, a slag making material is added into the melt in the graphite crucible, and heat preserving is carried out; and 6, after the slag making material is removed, heat preserving and natural cooling are carried out. According to the preparing method, the copper-chromium alloy is obtained by preparing the copper-chromium intermediate alloy in advance, and therefore the casting technological properties are improved.