The utility model relates to the field of automatic uncovering of reaction tubes, and discloses an automatic uncovering device for PCR reaction tubes. According to the washing
machine, a cover is fixedly connected to the lower portion of the pressing connecting
pipe, a pressing column is installed in the cover, a strong spring is arranged on the periphery of the pressing column, a detergent storage bin is arranged below the cover, and a washing
machine outflow opening is connected to the lower portion of the detergent storage bin; when the washing
machine is used, the washing liquid flows into the washing
liquid storage bin, after the outflow amount is appropriate, pressing is stopped, the washing liquid can stop flowing out, the outflow amount of the washing liquid can be conveniently controlled, the remaining washing liquid can be placed in the washing
liquid storage bin and then flows into the transmission column through the washing machine outflow opening, the washing liquid can better flow into the
sponge ball, and therefore the washing liquid can be better cleaned. The
sponge ball can be more sufficiently and averagely adsorbed to the detergent, so that the interior of the
reaction tube can be better and comprehensively cleaned, and the use convenience is improved.