The invention provides a control mechanism for the trailing edge flap of an agriculture light airplane. The control mechanism comprises an electric mechanism, a bracket I, a control operating rod I, a right-angle rocker arm I, a connecting rod I, a T-shaped rocker arm, a supporting seat, a connecting rod II, a right-angle rocker arm II, a control operating rod II, a bracket II and a support arm, wherein a flap control box is connected with the electric mechanism; the electric mechanism is hinged with the T-shaped rocker arm and the T-shaped rocker arm is connected with the supporting seat; one end of the connecting rod I and one end of the connecting rod II are respectively connected with the T-shaped rocker arm, and the other end of the connecting rod I and the other end of the connecting rod II are respectively connected with the right-angle rocker arm I and the right-angle rocker arm II; the right-angle rocker arm I and the right-angle rocker arm II are respectively connected with the bracket I and the bracket II; one end of the control operating rod I and one end of the control operating rod II are respectively connected with the right-angle rocker arm I and the right-angle rocker arm II, and the other end of the control operating rod I and the other end of the control operating rod II are respectively hinged with left and right flap control connectors. According to the control mechanism for the trailing edge flap of an agriculture light airplane disclosed by the invention, cross linking is realized through a set of mechanical transmission mechanism, the left and right independent flaps deflect at the same time, and the rudder synchronism problem is well solved.