The utility model provides a clamp device for screening LED chips. The clamp device is used for fixing an LED chip to be tested. The clamp device comprises a supporting block, a fixing block and a testing plate fixed at one end of the supporting block. One side of the fixing block is equipped with a recessed groove. Rigid conductive spring sheets are fixed in the recessed groove. The other side of the fixing block is fixed at the other end of the supporting block. Wires are arranged inside the supporting block and connect the testing plate to the rigid conductive spring sheets. An LED chip to be tested is clamped between the rigid conductive spring sheets and fixed in the recessed groove of the fixing block. Then the LED chip to be tested, the fixing block, the supporting block and the testing plate are placed in a light source base, pressing downwards is carried out by means of gravities of the fixing block and the supporting block, the LED chip to be tested is pressed in the light source base steadily, which facilitates testing of the LED chip to be tested. The clamp device for screening LED chips can fix an LED chip, avoids that an LED chip is soldered on the LED testing plate through a tin soldering mode, raises the testing effect and lowers the production cost.