Johnny Weir's Husband -- ARREST THIS MAN ... Weir Is Threatening Me!!!

Johnny Weir's estranged husband wants the Olympic figure skater thrown in jail -- for allegedly sending him email threats in the wake of their split ... and violating a restraining order in the process.

Victor Voronov filed the police report Monday with Lyndhurst PD in Jersey, claiming Weir had sent him a cryptic email ... strongly insinuating he planned to go public with allegations that Voronov had threatened his life.

Voronov not only claims Weir's allegations are false -- he told police the email was a violation of the restraining order he obtained against Weir last week, which prohibits Weir from contacting him in any way.