The invention discloses a magnetic attraction sealing type two-piece splicing helmet. The magnetic attraction sealing type two-piece splicing helmet comprises a front half-piece helmet shell and a rear half-piece helmet shell, a pin is arranged at the tops of the front half-piece helmet shell and the rear half-piece helmet shell for hinge joint to close the front half-piece helmet shell and the rear half-piece helmet shell to form an integrated head-worn helmet shell, a first magnetic strip is arranged on the front half-piece helmet shell, a second magnetic strip is arranged on the rear half-piece helmet shell, fixing lock columns are arranged on two sides below the front half-piece helmet shell respectively, and overturning lock catches corresponding to the fixing lock columns are arranged on two sides of the rear half-piece helmet shell respectively. The magnetic attraction sealing type two-piece splicing helmet has the advantages that the front half-piece helmet shell and the rear half-piece helmet shell can be opened or closed, so that the magnetic attraction sealing type two-piece splicing helmet is quite convenient to wear; the first magnetic strip and the second magnetic strip are used for attraction at the joint, and accordingly the magnetic attraction sealing type two-piece splicing helmet is firmer in connection, excellent in sealing effect and wide in applicable range.