The utility model discloses a ball ware is caught to oil gas well well head. Be equipped with the observation window between grate board and inflow entrance on catching the barrel of ball ware, observe the window for the barrel at the whole transparent section of thick bamboo wall between grate board and the inflow entrance or set up the intraoral transparent shrouding of offering of window on the section of thick bamboo wall of barrel. Carry out the open flow like this when catching the ball operation, suppress the pressure along with changeing layer ball at the fracturing reservoir, in formation pressure and the reservoir oil gas energy the comprehensive function down with certain speed along with fluid medium get into catch the barrel of ball ware in, and in the stop of being obstructed of grate board department, thereby the accessible observe the window confirm to change a layer ball whether successfully catch or catch the ball ware whether catch full catch the ball in -process can be inside the ball ware be caught to do not dismantle the volume of catching the nodule number of confirming under the condition of catching the ball ware and whether catch completely etc. The condition, reduce construction blindness, work efficiency is efficiently improved, and solved and caught the ball ware among the prior art and can't direct judgement whether catch the ball success or catch the ball ware and catch full problem.