The invention provides a working method of an agricultural vegetable planting device with a culture tray displacement function. The device comprises a bottom plate, and is characterized in that a first support pillar is fixedly connected to the middle of the upper side of the bottom plate; a rotary device is arranged on the top part of the first support pillar; a second support pillar is connectedto the top part of the rotary device; a first support plate is fixedly connected to the left side of the top part of the second support pillar; a second support plate is fixedly connected to the right side of the top part of the second support pillar; a position adjustment device is fixedly connected to the lower side of the left part of the first support plate. The working method of the agricultural vegetable planting device with the culture tray displacement function provided by the invention has the following beneficial effects that (1) a secondary rotary shaft drives an adjusting gear torotate, and a rack meshed with the adjusting gear moves downwards, so that an adsorption disc goes down; (2) after an adsorbent contacts the bottom part in a seed placement groove, a second installation column has a certain buffer amount under a spring action, so that an impact force of the adsorbent can be effectively reduced, and the service life of the adsorbent is improved.