The invention discloses a mounting bracket of an automobile radiator. The mounting bracket comprises a radiator mounting bracket body, a locking mechanism, a space adjusting support. The radiator mounting bracket body comprises a locking mechanism adjusting groove, the locking mechanism, limiting supports, a fixing screw hole, the space adjusting support, a bottom fixing support plate, an antiskidgroove, a locking handle, a fixed stand column, a top fixing support plate, an adjusting stand column, a mobile base block, an adjusting screw, an adjusting rubber block, wherein the space adjustingsupport is arranged between the bottom fixing support plate and the top fixing support of the radiator mounting bracket body; the limiting supports and the locking mechanism are arranged in the top fixing support, two limiting supports are arranged in the bottom fixing support, the radiator is limited and locked through the limiting supports and the locking mechanism, and the mounting bracket is reasonable in design, simple in structure, convenient to install and capable of being suitable for installing and fixing mounting bracket s of various types and sizes.