A multipurpose lead connecting device comprises a bottom plate (1), a conducting plate (3), a lead pressing screw (5), a flame retardant box (6), a support (11) and a dustpan-shaped shell (9). A bottom plate fixing hole (2) is formed in the bottom plate (1), the support (11) is arranged on the bottom plate (1), the flame retardant box (6) comprises a rear panel, a bottom panel, two side panels and an inserting plate (12), the lead pressing screw (5) is mounted on the conducting plate (3), and the shell (9) is fixed on the bottom plate (1) through a shell fixing screw (8). The multipurpose lead connecting device has the advantages that sparking and red burning of a ground screw meeting lightning current due to poor contact caused by oxidation corrosion in long-term exposure to wind and rain are prevented, fire disasters and explosion accidents endangering equipment and public security are avoided, incapability of opening the ground screw due to corrosion is avoided, ground resistance measuring experiments are facilitated, and the multipurpose lead connecting device can also be used for electric lead connection and branching and has functions such as fire prevention, explosion prevention, water prevention, rust prevention and easiness in detachment.