The invention discloses a laser welding experiment device capable of realizing magnetic field assisted molding. The device comprises a frame, a sample placing table, test panels, permanent magnets andiron cores, wherein the sample placing table is arranged on the frame; the test panels are arranged on the sample placing table; the permanent magnets are arranged on the test panels; and the iron cores are arranged below the test panels and connected with an external power supply. Compared with the prior art, the device has the following beneficial effects that the fusion depth of aluminum alloylaser welding is larger, the sum of the gravity of a molten pool and the reaction force of a key hole of the molten pool is larger than the surface tension of the bottom, and downward leakage is easier under the gasket-free condition to form an overlap. The device aims to prevent molten drops of aluminum alloy laser welding from leaking downwards under the gasket-free condition, reduce the flowing speed on the upper surface of the molten pool and improve the welding seam molding. Meanwhile, the experiment function is also taken into consideration, so that the test panels move relative to therectangular frame, a laser and magnetic field action area is static relative to the rectangular frame, and continuous observation of the welding process is realized.