The invention discloses a push-type suction device for sucking human tissue. The push-type suction device comprises a gas cylinder, a piston assembly and a one-way valve assembly; the gas cylinder comprises a piston operating cavity and a connecting tube, the connecting tube is communicated with the piston operating cavity, the piston assembly is slidingly arranged in the piston operating cavity in the axial direction, and the one-way valve assembly is arranged at an inlet of the connecting tube on the bottom surface of the piston operating cavity; the piston assembly comprises a piston rod, apiston head and a piston, a gas channel runs through the center of the piston rod in the axial direction, the piston rod and the piston head are separately provided and assembled together, the pistonhead is connected to the lower end of the piston rod, and a passage communicated with the gas channel is formed in the center of the piston head; the piston sleeves a piston mounting part between thepiston rod and the piston head, the lower end face of the piston is in lap joint with the top of the piston head, the portion, located at the passage, of the upper end face of the piston head is provided with a check valve, the lower end of the connecting tube of the gas cylinder is provided with a suction head, and corresponding suction force can be provided according to the thickness and size of a skin graft.