True density detection method and device and controller

The invention discloses a true density detection method, a true density detection device and a controller. The device comprises an inflation pump, an inflation pipeline, a measurement air chamber, a first valve body, a first air conveying pipeline, a plurality of second air conveying pipelines, a plurality of sample chambers, a plurality of cover bodies, a plurality of second valve bodies and an air pressure detector. The inflation pump is communicated with an inflation inlet of the measurement air chamber through an inflation pipeline, and the first valve body is located on the inflation pipeline; one end of the first gas conveying pipeline is communicated with one end of a gas outlet of the measuring gas chamber, the other end of the first gas conveying pipeline is communicated with one end of each second gas conveying pipeline, the other end of each second gas conveying pipeline is communicated with the corresponding sample chamber, and each second valve body is arranged on the corresponding second gas con