The invention discloses a proportion electromagnet which comprises a shell (1), a coil assembly (2), a pole shoe (3), a magnetic shielding ring (4), a guide sleeve (5), an iron core (6) and a push rod (7). A power connector (8) is connected onto the shell (1), a spring seat (9) is fixedly connected to the right end of the iron core (6), a through hole matched with the spring seat (9) is arranged on the right end surface of the shell (1), an adjusting screw (10) is mounted at the right end of the through hole, and a spring (11) is arranged between the adjusting screw (10) and the spring seat (9). The proportion electromagnet has the advantages that the proportion electromagnet is additionally provided with the spring seat, the spring and the adjusting screw, pre-tightening force which is applied on the iron core of an electromagnet by the spring can be conveniently changed by means of adjusting the adjusting screw, accordingly, acting force of the electromagnet at certain current or voltage can be changed, acting force of the proportion electromagnet at the certain current or voltage is adjustable, and the proportion electromagnet is simple and compact in structure, reasonable in design, convenient to adjust and high in practicality.