The invention relates to the technical field of cow breeding and discloses a cow milking device. The device comprises a rack, a milking portion and a pushing portion, wherein a first fixing plate and a sliding plate which is located above the first fixing plate and connected with the rack in a sliding mode are arranged on the rack, a first cavity body is formed in the sliding plate, and the milking portion is arranged on the sliding plate; the milking portion comprises milking tubes, inner layers which are composed of two sliding clamping plates with closed edges are arranged in the milking tubes, and the inner layers are in a corn shape and communicated with the first cavity body; a second compressed spring which is connected with the inner layers is arranged on the outer walls of the milking tubes, and the inner layers and the outer walls of the milking tubes form a second cavity body; the pushing portion is arranged on the first fixing plate and located below the milking portion, and the pushing portion comprises a motor which is fixedly arranged on the first fixing plate and an eccentric wheel which is driven by the motor; the rack further comprises a milk canister which is located below the pushing portion and connected with the rack in a sliding mode, and baffles are arranged in the milk canister to divide the milk canister into a collection layer and a refrigeration layer. According to the cow milking device, by simulating a hand milking mode, the damage on nipples of cows by milking is reduced, and the work efficiency is improved.