Disclosed is a mucosa staining system, wherein a first staining solution bottle (1) is connected to the first port of a first tee joint (5) through a first pipeline (3), and the second port of the first tee joint (5) is connected to a second staining solution bottle (2) or a flushing bottle (6) through a second pipeline (4), a pump line (7) is connected to the third port of the first tee joint (5), the pump line (7) is installed on a first power device (8), and the pump line (7) is connected to a washing pipe (9) and/or a spray pipe (10), and a first conversion device (11) is connected between the first pipeline (3) and the second pipeline (4). The mucosa staining system integrates the functions of washing and cleaning and staining of the gastrointestinal mucosa into one, and can realize the quick conversion between these two functions, has multiple modes available, can improve the diagnosis and treatment efficiency and comfortability for patients with a gastrointestinal endoscope, and can help reduce the occurrence of missed diagnosis and misdiagnosis, increase the early detection rate of digestive tract cancer, and at the same time, assist with giving accurate treatment using digestive endoscopies.Linvention concerne un système de coloration de muqueuse, une première bouteille de solution de coloration (1) étant reliée au premier orifice dun premier joint en té (5) par lintermédiaire dune première canalisation (3), et le deuxième orifice du premier joint en té (5) étant relié à une seconde bouteille de solution de coloration (2) ou une bouteille de rinçage (6) par lintermédiaire dune seconde canalisation (4), une conduite de pompe (7) étant reliée au troisième orifice du premier joint en té (5), la conduite de pompe (7) étant installée sur un premier dispositif dalimentation (8), et la conduite de pompe (7) étant reliée à un tuyau de lavage (9) et/ou un tuyau de pulvérisation (10), et un premier dispositif de conversion (11) étant relié entre la première canalisat
