The invention provides a fixing device and a portable lamp with same. The fixing device comprises a clamping assembly used for clamping a lamp foot rest and a foot rest assembly which is connected with the clamping assembly and used for supporting, the clamping assembly comprises a base, a first side plate which is fixed to the base and provided with a first screw hole, a second side plate which is fixed to the base, arranged to be opposite to the first side plate and provided with a second screw hole, a screw which is in threaded connection with the first screw hole or the second screw hole and a clamping block which is connected to the screw and located at the end between the first side plate and the second side plate. On the basis of the structure, assembling and disassembling of the clamping assembly and the lamp foot rest can be achieved rapidly by driving the screw to rotate, the support fixed point of the portable lamp is increased through the foot rest assembly, the wind resistance reliability of the portable lamp is improved, and the wind resistance reliability requirements of outdoor use of the portable lamp are met.