The invention discloses a field tray laying machine. The workload of manually laying growing trays is high, and people are easily fatigued due to the field operating environment. The field tray layingmachine disclosed by the invention comprises a ridge power guide rail, a ridge assisted guide rail, a lengthways moving device and a tray laying trolley. The lengthways moving device comprises a Hallsensor, a movable guide rail, a connecting rack, a support frame, a first geared motor, a second geared motor, a middle wheel and a side wheel group. The tray laying trolley comprises a frame, a wheel axle, a transverse moving drive part, a position regulation mechanism, a tray clip mechanism, a lifting mechanism and wheels. The position regulation mechanism comprises a regulation block, a hand wheel, a screw and a handle. The tray clip mechanism comprises a tray laying drive component, a tray laying frame and a clamping jaw component. The tray clamping jaw is driven by a cam, the action of laying a stack of growing trays one by one is realized by virtue of a telescopic reciprocating motion of the tray clamping jaw, the structure is compact, the motion is reliable, and the tray laying reliability is greatly improved.