Portable nucleic acid detection device, system and method

A portable nucleic acid detection device, comprising a main body;

• wherein
• the main body is provided with a mounting cavity for mounting a bearing module, the bearing module is configured to accommodate a reaction tube, and the reaction tube is configured to accommodate a to-be-detected sample;
• the bearing module is connected to a heating module, and the heating module is configured to regulate a temperature of the bearing module, so as to regulate a temperature of the reaction tube;
• the main body is connected to a light-emitting module, the light-emitting module is arranged at a bottom of the bearing module, and the bearing module is provided with a light-transmission hole facing the light-emitting module, such that light emitted from the light-emitting module irradiates the reaction tube via the light-transmission hole;
• and
• the main body is further provided with an observation window, a first side of the bearing module is provided with a first observation hole, and the first observation hole is configured to observe the reaction tube, when the bearing module is mounted in the mounting cavity, the observation window is configured to observe the reaction tube via the first observation hole.