A method for producing a polyolefin comprises steps 1 to 3 and satisfies requirements 1 and 2: Step 1: polymerizing an olefin in a first gas-phase polymerization tank to obtain polyolefin-containing particles; Step 2: transferring the polyolefin-containing particles obtained in the step 1 to a second gas-phase polymerization tank through a transfer pipe; and Step 3: polymerizing an olefin in the presence of the polyolefin-containing particles transferred in the step 2 in the second gas-phase polymerization tank; and Requirement 1: a connection place between the first gas-phase polymerization tank and the transfer pipe is higher than a connection place between the second gas-phase polymerization tank and the transfer pipe; and Requirement 2: when P 1 represents the pressure in the first gas-phase polymerization tank and P 2 represents the pressure in the second gas-phase polymerization tank, 130 kPa>=P 1 -P 2>=0 is satisfied.