The present invention discloses a weight-bearing socket and plug for a pendent lamp, and the pendent lamp can be installed and disassembled only by inserting or unscrewing the plug. The key point of the technical solution is: The linear transverse beam 8 is installed to the ceiling, and an earth wire can be connected to the screw 801; a wiring button is pressed for connecting a power line; the socket is installed to the transverse beam by using the bolt 9; the pendent lamp and the plug are assembled; the conducting wire is connected to the wiring terminal 10e; the plug positioning groove 12b1 is aligned with the positioning mark 101 of the socket and is inserted: the weight-bearing pin 3 is inserted into the pin clamping groove 12a1 and the lock tongue 6 is inserted into the lock tongue clamping groove; the binding post slider 5i is contracted inwards; the binding post 5a is pushed to move downwards and come into contact with the wiring vertical column 10d of the plug for realizing installation and electrical connection of the pendent lamp: the lock core 13b is pressed to push the lock tongue into the socket; the plug is rotated; the weight-bearing pin slides along the ramp 12a2; and when the positioning frustum 12b4 moves to the destination of the arc-shaped rotating positioning groove 115, the weight-bearing pin is contracted into the socket so the lamp can be disassembled.