Shifting fork piece device for infusion pump and infusion pump

The invention discloses a shifting fork piece device for an infusion pump and the infusion pump provided with the shifting fork piece device. The shifting fork piece device comprises a flexible sheet installing portion and a shifting fork piece portion installed on the installing portion. The flexible sheet installing portion is provided with a first side and a second side, wherein the first side and the second side are opposite in the thickness direction. The shifting fork piece portion is installed on the installing portion in the thickness direction and penetrates through the installing portion. The shifting fork piece portion comprises a pressing portion and a driving portion, wherein the pressing portion extends out of the installing portion to the first side of the installing portion, and the driving portion extends out of the installing portion to the second side of the installing portion. According to the shifting fork piece device and the infusion pump, liquid is prevented from entering a shell body of the infusion pump.