The invention provides a radial-inserting and radial-throttling type throttler and a balance sieve tube employing the same, wherein the throttler is used for controlling liquid flow of a liquid channel, and comprises a throttler main body and a throttler supporting disc; overflowing parts are radially arranged in an overflowing part mounting hole on the throttler main body, and the overflowing parts include a non-porous type and a porous type, and when the overflowing parts belong to the porous type, different amounts of overflowing holes are formed on the overflowing parts; the balance sieve tube comprises the liquid channel, namely a base pipe, a composite filtering sleeve component and the radial-inserting and radial-throttling type throttler, the composite filtering sleeve component and the throttler are coaxially sleeved on the periphery of the base pipe, and the composite filtering sleeve component comprises an inner protective jacket, a multi-layer filtering wire mesh and an external protective jacket. With rational combination of the overflowing parts having different amounts of holes, the overflowing holes on the base pipe can easily change between opening and closing and become larger and smaller, thereby realizing the purpose of throttling.