The invention provides a small-sized current acquisition module which comprises a printed circuit board, interface connectors, screw fixing connecting holes and an electronic component, wherein the screw fixing connecting holes are formed in the four corners of the printed circuit board; the interface connectors are arranged on the sides of the screw fixing connecting holes; and the electronic component is inserted in a circuit of the printed circuit board. Except for the connection of the connectors, screw fixing is performed, so that the connecting reliability is enhanced; the modular designfacilitates replacement and mounting; and the mounting size is reduced.