Test tube placing rack

The utility model discloses a test tube placing rack which comprises a rack body and an auxiliary test tube seat, the rack body comprises an inserting seat and a supporting seat, a plurality of first inserting holes for inserting test tubes are formed in the inserting seat, and the supporting seat is movably arranged in the inserting seat and used for supporting the test tubes; the two auxiliary test tube seats are rotatably arranged on the two sides of the insertion seat respectively and can be switched between a first position and a second position relative to the insertion seat; when the two auxiliary test tube bases are switched to the first positions, the two auxiliary test tube bases are located on the two sides of the insertion base respectively and used for assisting in fixing test tubes; when the two auxiliary test tube bases are switched to the second position, the two auxiliary test tube bases are both located above the inserting base, and the supporting base is jacked upwards so as to be lifted. A