The invention discloses an electromagnetic compatibility test load box of an automobile body controller. The electromagnetic compatibility test load box comprises a signal output module, a signal control button group, a load simulation module, a load indicating lamp group, a signal connection wire harness, a load connection wire harness, a wiring port and a data line, wherein a shell is in an aluminum shielding box structure with high electric conductivity; the signal output module and the load simulation module are located in the shell; and the shell signal control button group, the load indicating lamp group and the wiring port are mounted on the shell through a through hole on the shell respectively. In the electromagnetic compatibility test load box, through the control of the signal control button group, the signal output module can provide various input signals required by the normal work of a BCM (body control module), and control on the input signals of the BCM is realized; the load simulation module realizes simulation of the connected electrical appliance load of the body when the BCM works; and the load indicating lamp group realizes visual monitoring on the working state of the BCM.