Fixed-point sampling type liquid detection device

The invention, which relates to the field of detection devices, discloses a fixed-point sampling type liquid detection device comprising a device box. The lower end of the device box is fixedly connected with an outer detection cylinder; an inner detection cylinder is arranged in the outer detection cylinder; the upper end of the inner detection cylinder is connected with a rotary driving devicemounted in the device box; a movable ring cover is arranged at the lower end of the inner detection cylinder; and an elastic sealing device is arranged on the movable ring cover. A rotary driving device in the device box drives the inner detection cylinder to rotate in the outer detection cylinder. Under the rotary centrifugal effect of the inner detection cylinder, the elastic sealing device at the lower end of the inner detection cylinder is opened under the action of a centrifugal force; liquid at the detection point enters the inner detection cylinder; and the inner detection cylinder isfully and uniformly rotated