Constant-temperature test chamber

The utility model discloses a constant-temperature test chamber. The constant-temperature test chamber comprises a chamber body, wherein a test region is arranged in the inner container of the chamber body; a plurality of air guide plates are arranged on the left side of the test region; a plurality of air return plates are arranged on the right side of the test region; a partition plate is arranged on one end of the top part of the test region with the air guide plates and the air return plates; the air guide plates, the partition plate and the air return plates respectively form an air flue with the inner wall of the box body; an air outlet is formed between the adjacent two air guide plates; the caliber of the plurality of air outlets is gradually reduced from top to bottom; the caliber of the air outlet close to the partition plate is the largest; an air return hole is formed between the adjacent two air return plates; the caliber of the plurality of air return holes is gradually increased from top to bot