Self-pollution-discharge constant-volume detection device

The invention discloses a self-pollution-discharge constant-volume detection device which comprises a detection body, a pollution discharge port arranged on the detection body, a pollution discharge channel and a siphon channel, the pollution discharge channel and the siphon channel are arranged on the detection body, the pollution discharge port is communicated with the bottommost part of an inner cavity of the detection body, and the pollution discharge port is communicated with the siphon channel through the pollution discharge channel. And the siphon trigger point of the siphon channel is higher than the drain outlet and the highest point of the siphon channel. The detection device disclosed by the invention does not need to be externally provided with a liquid discharge pump, so that solution corrosivity and particle impurities are not limited, liquid in the detector can be automatically emptied, the influence of the solution impurities on pollution discharge can be weakened or even eliminated by adjusti