The invention discloses a small filling quantity compact condensing evaporator. The small filling quantity compact condensing evaporator comprises a barrel-shaped cylinder body, wherein the two ends of the cylinder body are open, and a first pipe plate and a second pipe plate are fixed on the inner wall and connected with a first sealing head and a second sealing head; a bad arcuate gap is formedbetween the upper portion of the first tube plate and the barrel body, a semicircular notch is formed between the second tube plate and the barrel body, multiple heat exchange pipes which are arrangedat intervals and provided with openings at the two ends are installed between the first pipe plate and the second pipe plate through pipe-plate upper heat exchange pipe installing hole ports, the upper end of the second tube plate is connected with a partition plate arranged along the axis of the barrel body, the partition plate divides an inner cavity of the barrel body into an upper cavity anda lower cavity, and the heat exchange tube is located in the lower cavity; the bad arcuate notch is opposite to the semi-circular notch and corresponds to the upper cavity, so that the upper cavity communicates with the arc-shaped cavity formed by the two sealing heads outside the two pipe plates; and a high-temperature circulating air outlet connecting pipe, a high-temperature circulating liquidinlet pipe, a low-temperature circulating liquid outlet pipe and a low-temperature circulating air inlet pipe are arranged on the cylinder body. According to the small filling quantity compact condensing evaporator, the structure is compact, and the filling quantity of the refrigeration working medium is reduced.