The utility model discloses a collection grain device, include: the rotation support platform, it can rotate a constant angle degree, the reciprocating motion groove, its fixed mounting is in on the rotation support platform, back support, its install in in the reciprocating motion groove, can reciprocating motion carries out in the reciprocating motion groove, the support, its with the rotatable connection of back support, a support is scraped to the arc, its fixed connection in the support bottom, the arc is scraped between the support a plurality of arcs of equipartition and is scraped the strip, the motor, it is fixed in on the support, the motor passes through the belt and drives it is rotatory that a support is scraped to the arc, displacement sensor, its fixed mounting scrapes a support in the arc for the monitoring is scraped the work grain facial height degree of strip and is scraped an overall height, the controller, its with the motor and the displacement sensor electricity federation, it is right to be used for motor rotation number adjusts.