The invention discloses an anti-theft envelope cash containing box. The anti-theft envelope cash containing box includes a cash box door, a gear, a rack, a box body and a push plate; the cash box door is movably mounted on the box body through a long shaft; the gear is mounted at one end of the long shaft; the rack is movably mounted at one side of the box body through short shafts; an opening and closing push rod is matched with one end of the rack; the other end of the rack is provided with an opening and closing spring; a unlocking push rod is provided with an unlocking slider in a sliding manner; one end of the unlocking slider is provided with an unlocking spring; and the unlocking push rod and the opening and closing push rod are respectively fixed to the push plate. According to the anti-theft envelope cash containing box of the invention, the push rod is adopted to push the unlocking slider to perform unlocking, and the gear rotates, so that the cash box door can be opened and closed, and therefore, the stability and reliability of the unlocking and door opening of the cash containing box can be increased; and an unlocking mechanism is simple. The anti-theft envelope cash containing box can store coins and paper money of arbitrary denominations. The anti-theft envelope cash containing box has the advantages of simple overall structure and convenient use.