The invention discloses a plastic pipe connecting pipe fitting. The plastic pipe connecting pipe fitting comprises a pipe body, a burst and dead screwing prevention thread connecting end and a direct-inserted connecting end; the pipe body is in a right-angled bent form or horizontal; a two-layer step structured gear base is arranged in a thread connecting end of a pipe fitting body; the gear baseis projected on the inner wall of the pipe fitting body; a connecting body of the burst and dead screwing prevention thread connecting end is arranged on the inner wall of the pipe fitting body; a pipe inserting port is formed in the other end of the pipe fitting body; and a first sealing ring of the direct-inserted connecting end, a plastic clamping ring base and a stainless steel clamping ring are arranged in the inserting port. Through the mode, the plastic pipe connecting pipe fitting is simple in structure, adopts all plastic materials, is low in cost and convenient to install and disassemble, and adopts two pipe connecting modes: the first pipe connecting mode achieves the function of preventing the pipe burst and dead screwing phenomenon; and the second pipe connecting mode achievesthe direct inserting function capable of directly inserting a pipe in the pipe fitting without needing auxiliary tools and technicians.