The invention relates to a device for connecting plastic pipes, and belongs to the field of living supplies. The device for connecting the plastic pipes is composed of an outer rotary disc anti-skid groove, a handle anti-skid groove, a handle anti-skid sleeve, a ratchet, an outer rotary disc anti-skid sleeve, an outer rotary disc inner gear, outer rotary disc inner ratchet wheels, large gears, anexpansion piece, a heating wire, an outer rotary disc, an inner rotary disc, a battery, power indicator lights, a switch, a battery power supply port, bearings, expansion piece racks, limiting rods, installation grooves, pinions, seat returning springs, handles, a battery clamping groove, a battery interface male head, a battery installation base, gear rod installation holes, gear rods, a batteryclamping buckle and a battery interface female head. The expansion piece is expanded by cooperation of the ratchet and the gears, by heating of the heating wire, thus the plastic pipe port is expanded, and then the plastic pipes are connected; and use is easy, the plastic pipes can be connected together more advantageously, and the risk of connecting the plastic pipes is reduced.